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@@ -47,27 +47,16 @@
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.set pop
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.set pop
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.endm
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.endm
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- .macro setup_c0_status_reset
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-#ifdef CONFIG_64BIT
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- setup_c0_status ST0_KX 0
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-#else
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- setup_c0_status 0 0
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-#endif
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- .endm
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-
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-#define RVECENT(f,n) \
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- b f; nop
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-#define XVECENT(f,bev) \
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- b f ; \
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- li k0,bev
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-
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.set noreorder
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.set noreorder
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.globl _start
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.globl _start
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.text
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.text
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_start:
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_start:
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- RVECENT(reset,0) # U-boot entry point
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- RVECENT(reset,1) # software reboot
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+ /* U-boot entry point */
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+ b reset
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+ nop
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+
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+ .org 0x10
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#ifdef CONFIG_SYS_XWAY_EBU_BOOTCFG
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#ifdef CONFIG_SYS_XWAY_EBU_BOOTCFG
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/*
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/*
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* Almost all Lantiq XWAY SoC devices have an external bus unit (EBU) to
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* Almost all Lantiq XWAY SoC devices have an external bus unit (EBU) to
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@@ -77,141 +66,39 @@ _start:
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* device with correct parameters. This config option is board-specific.
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* device with correct parameters. This config option is board-specific.
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*/
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*/
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.word CONFIG_SYS_XWAY_EBU_BOOTCFG
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.word CONFIG_SYS_XWAY_EBU_BOOTCFG
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- .word 0x00000000
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-#else
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- RVECENT(romReserved,2)
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+ .word 0x0
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#endif
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#endif
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- RVECENT(romReserved,3)
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- RVECENT(romReserved,4)
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- RVECENT(romReserved,5)
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- RVECENT(romReserved,6)
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- RVECENT(romReserved,7)
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- RVECENT(romReserved,8)
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- RVECENT(romReserved,9)
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- RVECENT(romReserved,10)
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- RVECENT(romReserved,11)
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- RVECENT(romReserved,12)
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- RVECENT(romReserved,13)
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- RVECENT(romReserved,14)
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- RVECENT(romReserved,15)
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- RVECENT(romReserved,16)
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- RVECENT(romReserved,17)
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- RVECENT(romReserved,18)
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- RVECENT(romReserved,19)
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- RVECENT(romReserved,20)
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- RVECENT(romReserved,21)
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- RVECENT(romReserved,22)
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- RVECENT(romReserved,23)
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- RVECENT(romReserved,24)
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- RVECENT(romReserved,25)
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- RVECENT(romReserved,26)
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- RVECENT(romReserved,27)
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- RVECENT(romReserved,28)
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- RVECENT(romReserved,29)
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- RVECENT(romReserved,30)
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- RVECENT(romReserved,31)
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- RVECENT(romReserved,32)
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- RVECENT(romReserved,33)
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- RVECENT(romReserved,34)
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- RVECENT(romReserved,35)
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- RVECENT(romReserved,36)
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- RVECENT(romReserved,37)
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- RVECENT(romReserved,38)
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- RVECENT(romReserved,39)
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- RVECENT(romReserved,40)
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- RVECENT(romReserved,41)
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- RVECENT(romReserved,42)
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- RVECENT(romReserved,43)
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- RVECENT(romReserved,44)
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- RVECENT(romReserved,45)
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- RVECENT(romReserved,46)
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- RVECENT(romReserved,47)
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- RVECENT(romReserved,48)
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- RVECENT(romReserved,49)
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- RVECENT(romReserved,50)
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- RVECENT(romReserved,51)
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- RVECENT(romReserved,52)
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- RVECENT(romReserved,53)
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- RVECENT(romReserved,54)
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- RVECENT(romReserved,55)
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- RVECENT(romReserved,56)
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- RVECENT(romReserved,57)
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- RVECENT(romReserved,58)
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- RVECENT(romReserved,59)
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- RVECENT(romReserved,60)
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- RVECENT(romReserved,61)
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- RVECENT(romReserved,62)
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- RVECENT(romReserved,63)
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- XVECENT(romExcHandle,0x200) # bfc00200: R4000 tlbmiss vector
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- RVECENT(romReserved,65)
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- RVECENT(romReserved,66)
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- RVECENT(romReserved,67)
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- RVECENT(romReserved,68)
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- RVECENT(romReserved,69)
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- RVECENT(romReserved,70)
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- RVECENT(romReserved,71)
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- RVECENT(romReserved,72)
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- RVECENT(romReserved,73)
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- RVECENT(romReserved,74)
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- RVECENT(romReserved,75)
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- RVECENT(romReserved,76)
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- RVECENT(romReserved,77)
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- RVECENT(romReserved,78)
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- RVECENT(romReserved,79)
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- XVECENT(romExcHandle,0x280) # bfc00280: R4000 xtlbmiss vector
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- RVECENT(romReserved,81)
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- RVECENT(romReserved,82)
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- RVECENT(romReserved,83)
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- RVECENT(romReserved,84)
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- RVECENT(romReserved,85)
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- RVECENT(romReserved,86)
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- RVECENT(romReserved,87)
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- RVECENT(romReserved,88)
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- RVECENT(romReserved,89)
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- RVECENT(romReserved,90)
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- RVECENT(romReserved,91)
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- RVECENT(romReserved,92)
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- RVECENT(romReserved,93)
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- RVECENT(romReserved,94)
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- RVECENT(romReserved,95)
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- XVECENT(romExcHandle,0x300) # bfc00300: R4000 cache vector
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- RVECENT(romReserved,97)
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- RVECENT(romReserved,98)
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- RVECENT(romReserved,99)
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- RVECENT(romReserved,100)
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- RVECENT(romReserved,101)
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- RVECENT(romReserved,102)
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- RVECENT(romReserved,103)
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- RVECENT(romReserved,104)
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- RVECENT(romReserved,105)
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- RVECENT(romReserved,106)
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- RVECENT(romReserved,107)
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- RVECENT(romReserved,108)
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- RVECENT(romReserved,109)
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- RVECENT(romReserved,110)
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- RVECENT(romReserved,111)
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- XVECENT(romExcHandle,0x380) # bfc00380: R4000 general vector
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- RVECENT(romReserved,113)
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- RVECENT(romReserved,114)
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- RVECENT(romReserved,115)
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- RVECENT(romReserved,116)
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- RVECENT(romReserved,116)
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- RVECENT(romReserved,118)
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- RVECENT(romReserved,119)
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- RVECENT(romReserved,120)
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- RVECENT(romReserved,121)
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- RVECENT(romReserved,122)
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- RVECENT(romReserved,123)
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- RVECENT(romReserved,124)
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- RVECENT(romReserved,125)
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- RVECENT(romReserved,126)
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- RVECENT(romReserved,127)
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- /*
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- * We hope there are no more reserved vectors!
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- * 128 * 8 == 1024 == 0x400
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- * so this is address R_VEC+0x400 == 0xbfc00400
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- */
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+ .org 0x200
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+ /* TLB refill, 32 bit task */
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+1: b 1b
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+ nop
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+
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+ .org 0x280
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+ /* XTLB refill, 64 bit task */
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+1: b 1b
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+ nop
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+
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+ .org 0x300
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+ /* Cache error exception */
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+1: b 1b
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+ nop
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+
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+ .org 0x380
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+ /* General exception */
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+1: b 1b
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+ nop
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+
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+ .org 0x400
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+ /* Catch interrupt exceptions */
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+1: b 1b
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+ nop
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+
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+ .org 0x480
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+ /* EJTAG debug exception */
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+1: b 1b
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+ nop
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+
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.align 4
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.align 4
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reset:
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reset:
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@@ -222,7 +109,7 @@ reset:
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/* WP(Watch Pending), SW0/1 should be cleared */
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/* WP(Watch Pending), SW0/1 should be cleared */
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mtc0 zero, CP0_CAUSE
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mtc0 zero, CP0_CAUSE
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- setup_c0_status_reset
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+ setup_c0_status 0 0
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/* Init Timer */
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/* Init Timer */
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mtc0 zero, CP0_COUNT
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mtc0 zero, CP0_COUNT
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@@ -286,7 +173,7 @@ relocate_code:
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sub s1, s2, t0 # s1 <-- relocation offset
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sub s1, s2, t0 # s1 <-- relocation offset
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la t3, in_ram
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la t3, in_ram
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- lw t2, -12(t3) # t2 <-- uboot_end_data
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+ lw t2, -12(t3) # t2 <-- __image_copy_end
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move t1, a2
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move t1, a2
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add gp, s1 # adjust gp
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add gp, s1 # adjust gp
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@@ -314,9 +201,10 @@ relocate_code:
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jr t0
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jr t0
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nop
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nop
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+ .word __rel_dyn_end
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+ .word __rel_dyn_start
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+ .word __image_copy_end
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.word _GLOBAL_OFFSET_TABLE_
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.word _GLOBAL_OFFSET_TABLE_
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- .word uboot_end_data
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- .word uboot_end
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.word num_got_entries
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.word num_got_entries
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in_ram:
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in_ram:
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@@ -327,7 +215,7 @@ in_ram:
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* generated by GNU ld. Skip these reserved entries from relocation.
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* generated by GNU ld. Skip these reserved entries from relocation.
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*/
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*/
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lw t3, -4(t0) # t3 <-- num_got_entries
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lw t3, -4(t0) # t3 <-- num_got_entries
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- lw t4, -16(t0) # t4 <-- _GLOBAL_OFFSET_TABLE_
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+ lw t4, -8(t0) # t4 <-- _GLOBAL_OFFSET_TABLE_
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add t4, s1 # t4 now holds relocated _G_O_T_
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add t4, s1 # t4 now holds relocated _G_O_T_
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addi t4, t4, 8 # skipping first two entries
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addi t4, t4, 8 # skipping first two entries
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li t2, 2
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li t2, 2
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@@ -341,17 +229,45 @@ in_ram:
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blt t2, t3, 1b
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blt t2, t3, 1b
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addi t4, 4
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addi t4, 4
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- /* Clear BSS */
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- lw t1, -12(t0) # t1 <-- uboot_end_data
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- lw t2, -8(t0) # t2 <-- uboot_end
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- add t1, s1 # adjust pointers
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- add t2, s1
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+ /* Update dynamic relocations */
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+ lw t1, -16(t0) # t1 <-- __rel_dyn_start
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+ lw t2, -20(t0) # t2 <-- __rel_dyn_end
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+
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+ b 2f # skip first reserved entry
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+ addi t1, 8
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+
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+1:
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+ lw t3, -4(t1) # t3 <-- relocation info
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+
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+ sub t3, 3
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+ bnez t3, 2f # skip non R_MIPS_REL32 entries
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+ nop
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+
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+ lw t3, -8(t1) # t3 <-- location to fix up in FLASH
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+
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+ lw t4, 0(t3) # t4 <-- original pointer
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+ add t4, s1 # t4 <-- adjusted pointer
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+
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+ add t3, s1 # t3 <-- location to fix up in RAM
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+ sw t4, 0(t3)
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+
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+2:
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+ blt t1, t2, 1b
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+ addi t1, 8 # each rel.dyn entry is 8 bytes
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+
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+ /*
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+ * Clear BSS
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+ *
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+ * GOT is now relocated. Thus __bss_start and __bss_end can be
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+ * accessed directly via $gp.
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+ */
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+ la t1, __bss_start # t1 <-- __bss_start
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+ la t2, __bss_end # t2 <-- __bss_end
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- sub t1, 4
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1:
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1:
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- addi t1, 4
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- bltl t1, t2, 1b
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- sw zero, 0(t1)
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+ sw zero, 0(t1)
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+ blt t1, t2, 1b
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+ addi t1, 4
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move a0, s0 # a0 <-- gd
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move a0, s0 # a0 <-- gd
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la t9, board_init_r
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la t9, board_init_r
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@@ -359,12 +275,3 @@ in_ram:
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move a1, s2
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move a1, s2
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.end relocate_code
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.end relocate_code
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-
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- /* Exception handlers */
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-romReserved:
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- b romReserved
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- nop
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-
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-romExcHandle:
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- b romExcHandle
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- nop
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