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-/*
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- * Most of this taken from Redboot hal_platform_setup.h with cleanup
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- *
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- * See file CREDITS for list of people who contributed to this
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- * project.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License as
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- * published by the Free Software Foundation; either version 2 of
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- * the License, or (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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- * MA 02111-1307 USA
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- */
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-
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-#include <config.h>
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-#include <version.h>
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-#include <asm/arch/pxa-regs.h>
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-
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-DRAM_SIZE: .long CONFIG_SYS_DRAM_SIZE
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-
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-/* wait for coprocessor write complete */
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- .macro CPWAIT reg
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- mrc p15,0,\reg,c2,c0,0
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- mov \reg,\reg
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- sub pc,pc,#4
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- .endm
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-
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- .macro SET_LED val
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- ldr r6, =GPCR2
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- ldr r7, =0
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- str r7, [r6]
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- ldr r6, =GPSR2
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- ldr r7, =\val
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- str r7, [r6]
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- .endm
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-
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-
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-.globl lowlevel_init
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-lowlevel_init:
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-
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- mov r10, lr
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-
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- /* Set up GPIO pins first */
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-
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- ldr r0, =GPSR0
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- ldr r1, =CONFIG_SYS_GPSR0_VAL
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- str r1, [r0]
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-
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- ldr r0, =GPSR1
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- ldr r1, =CONFIG_SYS_GPSR1_VAL
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- str r1, [r0]
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-
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- ldr r0, =GPSR2
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- ldr r1, =CONFIG_SYS_GPSR2_VAL
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- str r1, [r0]
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-
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- ldr r0, =GPCR0
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- ldr r1, =CONFIG_SYS_GPCR0_VAL
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- str r1, [r0]
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-
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- ldr r0, =GPCR1
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- ldr r1, =CONFIG_SYS_GPCR1_VAL
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- str r1, [r0]
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-
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- ldr r0, =GPCR2
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- ldr r1, =CONFIG_SYS_GPCR2_VAL
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- str r1, [r0]
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-
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- ldr r0, =GRER0
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- ldr r1, =CONFIG_SYS_GRER0_VAL
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- str r1, [r0]
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-
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- ldr r0, =GRER1
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- ldr r1, =CONFIG_SYS_GRER1_VAL
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- str r1, [r0]
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-
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- ldr r0, =GRER2
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- ldr r1, =CONFIG_SYS_GRER2_VAL
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- str r1, [r0]
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-
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- ldr r0, =GFER0
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- ldr r1, =CONFIG_SYS_GFER0_VAL
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- str r1, [r0]
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-
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- ldr r0, =GFER1
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- ldr r1, =CONFIG_SYS_GFER1_VAL
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- str r1, [r0]
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-
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- ldr r0, =GFER2
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- ldr r1, =CONFIG_SYS_GFER2_VAL
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- str r1, [r0]
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-
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- ldr r0, =GPDR0
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- ldr r1, =CONFIG_SYS_GPDR0_VAL
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- str r1, [r0]
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-
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- ldr r0, =GPDR1
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- ldr r1, =CONFIG_SYS_GPDR1_VAL
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- str r1, [r0]
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-
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- ldr r0, =GPDR2
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- ldr r1, =CONFIG_SYS_GPDR2_VAL
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- str r1, [r0]
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-
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- ldr r0, =GAFR0_L
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- ldr r1, =CONFIG_SYS_GAFR0_L_VAL
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- str r1, [r0]
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-
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- ldr r0, =GAFR0_U
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- ldr r1, =CONFIG_SYS_GAFR0_U_VAL
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- str r1, [r0]
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-
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- ldr r0, =GAFR1_L
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- ldr r1, =CONFIG_SYS_GAFR1_L_VAL
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- str r1, [r0]
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-
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- ldr r0, =GAFR1_U
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- ldr r1, =CONFIG_SYS_GAFR1_U_VAL
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- str r1, [r0]
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-
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- ldr r0, =GAFR2_L
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- ldr r1, =CONFIG_SYS_GAFR2_L_VAL
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- str r1, [r0]
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-
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- ldr r0, =GAFR2_U
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- ldr r1, =CONFIG_SYS_GAFR2_U_VAL
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- str r1, [r0]
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-
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- /* enable GPIO pins */
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- ldr r0, =PSSR
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- ldr r1, =CONFIG_SYS_PSSR_VAL
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- str r1, [r0]
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-
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- SET_LED 1
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-
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- ldr r3, =MSC1 /* low - bank 2 Lubbock Registers / SRAM */
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- ldr r2, =CONFIG_SYS_MSC1_VAL /* high - bank 3 Ethernet Controller */
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- str r2, [r3] /* need to set MSC1 before trying to write to the HEX LEDs */
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- ldr r2, [r3] /* need to read it back to make sure the value latches (see MSC section of manual) */
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-
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-
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-/*********************************************************************
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- Initlialize Memory Controller
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-
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- See PXA250 Operating System Developer's Guide
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-
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- pause for 200 uSecs- allow internal clocks to settle
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- *Note: only need this if hard reset... doing it anyway for now
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-*/
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-
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- @ Step 1
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- @ ---- Wait 200 usec
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- ldr r3, =OSCR @ reset the OS Timer Count to zero
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- mov r2, #0
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- str r2, [r3]
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- ldr r4, =0x300 @ really 0x2E1 is about 200usec, so 0x300 should be plenty
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-1:
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- ldr r2, [r3]
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- cmp r4, r2
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- bgt 1b
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-
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- SET_LED 2
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-
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-mem_init:
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- @ get memory controller base address
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- ldr r1, =MEMC_BASE
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-
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-
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-@****************************************************************************
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-@ Step 2
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-@
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-
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- @ Step 2a
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- @ write msc0, read back to ensure data latches
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- @
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- ldr r2, =CONFIG_SYS_MSC0_VAL
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- str r2, [r1, #MSC0_OFFSET]
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- ldr r2, [r1, #MSC0_OFFSET]
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-
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- @ write msc1
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- ldr r2, =CONFIG_SYS_MSC1_VAL
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- str r2, [r1, #MSC1_OFFSET]
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- ldr r2, [r1, #MSC1_OFFSET]
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-
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- @ write msc2
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- ldr r2, =CONFIG_SYS_MSC2_VAL
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- str r2, [r1, #MSC2_OFFSET]
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- ldr r2, [r1, #MSC2_OFFSET]
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-
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- @ Step 2b
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- @ write mecr
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- ldr r2, =CONFIG_SYS_MECR_VAL
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- str r2, [r1, #MECR_OFFSET]
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-
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- @ write mcmem0
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- ldr r2, =CONFIG_SYS_MCMEM0_VAL
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- str r2, [r1, #MCMEM0_OFFSET]
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-
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- @ write mcmem1
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- ldr r2, =CONFIG_SYS_MCMEM1_VAL
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- str r2, [r1, #MCMEM1_OFFSET]
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-
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- @ write mcatt0
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- ldr r2, =CONFIG_SYS_MCATT0_VAL
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- str r2, [r1, #MCATT0_OFFSET]
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-
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- @ write mcatt1
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- ldr r2, =CONFIG_SYS_MCATT1_VAL
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- str r2, [r1, #MCATT1_OFFSET]
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-
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- @ write mcio0
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- ldr r2, =CONFIG_SYS_MCIO0_VAL
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- str r2, [r1, #MCIO0_OFFSET]
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-
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- @ write mcio1
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- ldr r2, =CONFIG_SYS_MCIO1_VAL
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- str r2, [r1, #MCIO1_OFFSET]
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-
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- /*SET_LED 3 */
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-
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- @ Step 2c
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- @ fly-by-dma is defeatured on this part
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- @ write flycnfg
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- @ldr r2, =CONFIG_SYS_FLYCNFG_VAL
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- @str r2, [r1, #FLYCNFG_OFFSET]
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-
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-/* FIXME Does this sequence really make sense */
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-#ifdef REDBOOT_WAY
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- @ Step 2d
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- @ get the mdrefr settings
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- ldr r3, =CONFIG_SYS_MDREFR_VAL
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-
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- @ extract DRI field (we need a valid DRI field)
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- @
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- ldr r2, =0xFFF
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-
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- @ valid DRI field in r3
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- @
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- and r3, r3, r2
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-
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- @ get the reset state of MDREFR
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- @
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- ldr r4, [r1, #MDREFR_OFFSET]
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-
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- @ clear the DRI field
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- @
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- bic r4, r4, r2
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-
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- @ insert the valid DRI field loaded above
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- @
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- orr r4, r4, r3
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-
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- @ write back mdrefr
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- @
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- str r4, [r1, #MDREFR_OFFSET]
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-
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- @ *Note: preserve the mdrefr value in r4 *
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-
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- /*SET_LED 4 */
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-
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-@****************************************************************************
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-@ Step 3
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-@
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-@ NO SRAM
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-
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- mov pc, r10
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-
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-
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-@****************************************************************************
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-@ Step 4
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-@
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-
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- @ Assumes previous mdrefr value in r4, if not then read current mdrefr
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-
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- @ clear the free-running clock bits
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- @ (clear K0Free, K1Free, K2Free
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- @
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- bic r4, r4, #(0x00800000 | 0x01000000 | 0x02000000)
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-
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- @ set K0RUN for CPLD clock
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- @
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- orr r4, r4, #0x00002000
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-
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- @ set K1RUN if bank 0 installed
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- @
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- orr r4, r4, #0x00010000
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-
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- @ write back mdrefr
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- @
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- str r4, [r1, #MDREFR_OFFSET]
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- ldr r4, [r1, #MDREFR_OFFSET]
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-
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- @ deassert SLFRSH
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- @
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- bic r4, r4, #0x00400000
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-
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- @ write back mdrefr
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- @
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- str r4, [r1, #MDREFR_OFFSET]
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-
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- @ assert E1PIN
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- @
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- orr r4, r4, #0x00008000
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-
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- @ write back mdrefr
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- @
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- str r4, [r1, #MDREFR_OFFSET]
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- ldr r4, [r1, #MDREFR_OFFSET]
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- nop
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- nop
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-#else
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- @ Step 2d
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- @ get the mdrefr settings
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- ldr r3, =CONFIG_SYS_MDREFR_VAL
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-
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- @ write back mdrefr
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- @
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- str r4, [r1, #MDREFR_OFFSET]
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-
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- @ Step 4
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-
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- @ set K0RUN for CPLD clock
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- @
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- orr r4, r4, #0x00002000
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-
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- @ set K1RUN for bank 0
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- @
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- orr r4, r4, #0x00010000
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-
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- @ write back mdrefr
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- @
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- str r4, [r1, #MDREFR_OFFSET]
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- ldr r4, [r1, #MDREFR_OFFSET]
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-
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- @ deassert SLFRSH
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- @
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- bic r4, r4, #0x00400000
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-
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- @ write back mdrefr
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- @
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- str r4, [r1, #MDREFR_OFFSET]
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-
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- @ assert E1PIN
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- @
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- orr r4, r4, #0x00008000
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-
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- @ write back mdrefr
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- @
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- str r4, [r1, #MDREFR_OFFSET]
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- ldr r4, [r1, #MDREFR_OFFSET]
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- nop
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- nop
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-#endif
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-
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- @ Step 4d
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- @ fetch platform value of mdcnfg
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- @
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- ldr r2, =CONFIG_SYS_MDCNFG_VAL
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-
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- @ disable all sdram banks
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- @
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- bic r2, r2, #(MDCNFG_DE0 | MDCNFG_DE1)
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- bic r2, r2, #(MDCNFG_DE2 | MDCNFG_DE3)
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-
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- @ program banks 0/1 for bus width
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- @
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- bic r2, r2, #MDCNFG_DWID0 @0=32-bit
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-
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- @ write initial value of mdcnfg, w/o enabling sdram banks
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- @
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- str r2, [r1, #MDCNFG_OFFSET]
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-
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- @ Step 4e
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- @ pause for 200 uSecs
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- @
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- ldr r3, =OSCR @ reset the OS Timer Count to zero
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- mov r2, #0
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- str r2, [r3]
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- ldr r4, =0x300 @ really 0x2E1 is about 200usec, so 0x300 should be plenty
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-1:
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- ldr r2, [r3]
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- cmp r4, r2
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- bgt 1b
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-
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- /*SET_LED 5 */
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-
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- /* Why is this here??? */
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- mov r0, #0x78 @turn everything off
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- mcr p15, 0, r0, c1, c0, 0 @(caches off, MMU off, etc.)
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-
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- @ Step 4f
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- @ Access memory *not yet enabled* for CBR refresh cycles (8)
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- @ - CBR is generated for all banks
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-
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- ldr r2, =CONFIG_SYS_DRAM_BASE
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- str r2, [r2]
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- str r2, [r2]
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- str r2, [r2]
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- str r2, [r2]
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- str r2, [r2]
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- str r2, [r2]
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- str r2, [r2]
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- str r2, [r2]
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-
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- @ Step 4g
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- @get memory controller base address
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- @
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- ldr r1, =MEMC_BASE
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-
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- @fetch current mdcnfg value
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- @
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- ldr r3, [r1, #MDCNFG_OFFSET]
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-
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- @enable sdram bank 0 if installed (must do for any populated bank)
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- @
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- orr r3, r3, #MDCNFG_DE0
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-
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- @write back mdcnfg, enabling the sdram bank(s)
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- @
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- str r3, [r1, #MDCNFG_OFFSET]
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-
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- @ Step 4h
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|
- @ write mdmrs
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|
|
- @
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- ldr r2, =CONFIG_SYS_MDMRS_VAL
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|
|
- str r2, [r1, #MDMRS_OFFSET]
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|
|
-
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|
|
- @ Done Memory Init
|
|
|
-
|
|
|
- /*SET_LED 6 */
|
|
|
-
|
|
|
- @********************************************************************
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|
|
- @ Disable (mask) all interrupts at the interrupt controller
|
|
|
- @
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|
-
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|
|
- @ clear the interrupt level register (use IRQ, not FIQ)
|
|
|
- @
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|
|
- mov r1, #0
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|
|
- ldr r2, =ICLR
|
|
|
- str r1, [r2]
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|
|
-
|
|
|
- @ Set interrupt mask register
|
|
|
- @
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|
|
- ldr r1, =CONFIG_SYS_ICMR_VAL
|
|
|
- ldr r2, =ICMR
|
|
|
- str r1, [r2]
|
|
|
-
|
|
|
- @ ********************************************************************
|
|
|
- @ Disable the peripheral clocks, and set the core clock
|
|
|
- @
|
|
|
-
|
|
|
- @ Turn Off ALL on-chip peripheral clocks for re-configuration
|
|
|
- @
|
|
|
- ldr r1, =CKEN
|
|
|
- mov r2, #0
|
|
|
- str r2, [r1]
|
|
|
-
|
|
|
- @ set core clocks
|
|
|
- @
|
|
|
- ldr r2, =CONFIG_SYS_CCCR_VAL
|
|
|
- ldr r1, =CCCR
|
|
|
- str r2, [r1]
|
|
|
-
|
|
|
-#ifdef ENABLE32KHZ
|
|
|
- @ enable the 32Khz oscillator for RTC and PowerManager
|
|
|
- @
|
|
|
- ldr r1, =OSCC
|
|
|
- mov r2, #OSCC_OON
|
|
|
- str r2, [r1]
|
|
|
-
|
|
|
- @ NOTE: spin here until OSCC.OOK get set,
|
|
|
- @ meaning the PLL has settled.
|
|
|
- @
|
|
|
-60:
|
|
|
- ldr r2, [r1]
|
|
|
- ands r2, r2, #1
|
|
|
- beq 60b
|
|
|
-#endif
|
|
|
-
|
|
|
- @ Turn on needed clocks
|
|
|
- @
|
|
|
- ldr r1, =CKEN
|
|
|
- ldr r2, =CONFIG_SYS_CKEN_VAL
|
|
|
- str r2, [r1]
|
|
|
-
|
|
|
- /*SET_LED 7 */
|
|
|
-
|
|
|
-/* Is this needed???? */
|
|
|
-#define NODEBUG
|
|
|
-#ifdef NODEBUG
|
|
|
- /*Disable software and data breakpoints */
|
|
|
- mov r0,#0
|
|
|
- mcr p15,0,r0,c14,c8,0 /* ibcr0 */
|
|
|
- mcr p15,0,r0,c14,c9,0 /* ibcr1 */
|
|
|
- mcr p15,0,r0,c14,c4,0 /* dbcon */
|
|
|
-
|
|
|
- /*Enable all debug functionality */
|
|
|
- mov r0,#0x80000000
|
|
|
- mcr p14,0,r0,c10,c0,0 /* dcsr */
|
|
|
-
|
|
|
-#endif
|
|
|
-
|
|
|
- /*SET_LED 8 */
|
|
|
-
|
|
|
- mov pc, r10
|
|
|
-
|
|
|
-@ End lowlevel_init
|