sbc8548: replace README with completely new document

The previous README.sbc8548 was pretty much content-free. Replace
it with something that actually gives the end user some relevant
hardware details, and also lists the u-boot configuration choices.

Also in the cosmetic department, fix the bogus line in the Makefile
that was carried over from the SBC8560 Makefile, and the typo in
the sbc8548.c copyright.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

board/sbc8548/Makefile

@@ -2,8 +2,8 @@
 # (C) Copyright 2004-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
-# (C) Copyright 2004 Wind River Systems Inc <www.windriver.com>.
-# Added support for Wind River SBC8560 board
+# (C) Copyright 2007 Wind River Systems Inc <www.windriver.com>.
+# Added support for Wind River SBC8548 board
 #
 # See file CREDITS for list of people who contributed to this
 # project.

board/sbc8548/sbc8548.c

@@ -1,5 +1,6 @@
 /*
- * Copyright 2007 Wind River Systemes, Inc. <www.windriver.com>
+ * Copyright 2007,2009 Wind River Systems, Inc. <www.windriver.com>
+ *
  * Copyright 2007 Embedded Specialties, Inc.
  *
  * Copyright 2004, 2007 Freescale Semiconductor.

doc/README.sbc8548

@@ -1,27 +1,176 @@
-Wind River SBC8548 reference board
-===========================
+Intro:
+======
 
-Copyright 2007, Embedded Specialties, Inc.
-Copyright 2007 Wind River Systemes, Inc.
------------------------------
+The SBC8548 is a stand alone single board computer with a 1GHz
+MPC8548 CPU, 8MB boot flash, 64MB user flash and, 256MB DDR2 400MHz
+memory. It also has 128MB SDRAM 100MHz LBC memory, with both a PCI-e,
+and a PCI-X slot, dual mini-DB9 for UART, and dual RJ-45 for eTSEC
+ethernet connections.
 
-1. Building U-Boot
-------------------
-The SBC8548 code is known to build using ELDK 4.1.
+U-boot Configuration:
+=====================
 
-    $ make sbc8548_config
-    Configuring for sbc8548 board...
+The following possible u-boot configuration targets are available:
 
-    $ make
+	1) sbc8548_config
+	2) sbc8548_PCI_33_config
+	3) sbc8548_PCI_66_config
+	4) sbc8548_PCI_33_PCIE_config
+	5) sbc8548_PCI_66_PCIE_config
 
+Generally speaking, most people should choose to use #5.  Details
+of each choice are listed below.
 
-2. Switch and Jumper Settings
------------------------------
-All Jumpers & Switches are in their default positions.  Please refer to
-the board documentation for details.  Some settings control CPU voltages
-and settings may change with board revisions.
+Choice #1 does not enable CONFIG_PCI, and assumes that the PCI slot
+will be left empty (M66EN high), and so the board will operate with
+a base clock of 66MHz.  Note that you need both PCI enabled in u-boot
+and linux in order to have functional PCI under linux.
 
-3. Known limitations
---------------------
-PCI:
-	The code to support PCI is currently disabled and has not been verified.
+The second enables PCI support and builds for a 33MHz clock rate.  Note
+that if a 33MHz 32bit card is inserted in the slot, then the whole board
+will clock down to a 33MHz base clock instead of the default 66MHz.  This
+will change the baud clocks and mess up your serial console output if you
+were previously running at 66MHz.  If you want to use a 33MHz PCI card,
+then you should build a U-Boot with a _PCI_33_ config and store this
+to flash prior to powering down the board and inserting the 33MHz PCI
+card. [The above discussion assumes that the SW2[1-4] has not been changed
+to reflect a different CCB:SYSCLK ratio]
+
+The third option builds PCI support in, and leaves the clocking at the
+default 66MHz.  Options four and five are just repeats of option two
+and three, but with PCI-e support enabled as well.
+
+PCI output listing with an intel e1000 PCI-x and a Syskonnect SK-9Exx
+is shown below for sbc8548_PCI_66_PCIE_config.  (Note that PCI-e with
+a 33MHz PCI configuration is currently untested.)
+
+    => pci 0
+    Scanning PCI devices on bus 0
+    BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
+    _____________________________________________________________
+    00.00.00   0x1057     0x0012     Processor               0x20
+    00.01.00   0x8086     0x1026     Network controller      0x00
+    => pci 1
+    Scanning PCI devices on bus 1
+    BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
+    _____________________________________________________________
+    01.00.00   0x1957     0x0012     Processor               0x20
+    => pci 2
+    Scanning PCI devices on bus 2
+    BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
+    _____________________________________________________________
+    02.00.00   0x1148     0x9e00     Network controller      0x00
+    =>
+
+
+Hardware Reference:
+===================
+
+The following contains some summary information on hardware settings
+that are relevant to u-boot, based on the board manual.  For the
+most up to date and complete details of the board, please request the
+reference manual ERG-00327-001.pdf from www.windriver.com
+
+Boot flash:
+	intel V28F640Jx, 8192x8 (one device) at 0xff80_0000
+
+Sodimm flash:
+	intel V28F128Jx, 16384x8 (4 devices) at 0xfb80_0000
+
+
+	Jumpers:
+
+Jumper		Name		ON		OFF
+----------------------------------------------------------------
+JP12		CS0/CS6 swap	see note[*]	see note[*]
+
+JP13		SODIMM flash	write OK	writes disabled
+		write prot.
+
+JP14		HRESET/TRST	joined		isolated
+
+JP15		PWR ON		when AC pwr	use S1 for on/off
+
+JP16		Demo LEDs	lit		not lit
+
+JP19		PCI mode	PCI		PCI-X
+
+
+[*]JP12, when jumpered parallel to the SODIMM, puts the boot flash
+onto /CS0 and the SODIMM flash on /CS6 (default).  When JP12
+is jumpered parallel to the LBC-SDRAM, then /CS0 is for the
+SODIMM flash and /CS6 is for the boot flash.  Note that in this
+alternate setting, you also need to switch SW2.8 to ON.  Currently
+u-boot doesn't support booting off the SODIMM in this alternate
+setting without manually altering BR0/OR0 and BR6/OR6 in the
+board config file appropriately.
+
+
+	Switches:
+
+The defaults are marked with a *
+
+Name		Desc.			ON		OFF
+------------------------------------------------------------------
+S1		Pwr toggle		n/a		n/a
+
+SW2.1		CFG_SYS_PLL0		1		0*
+SW2.2		CFG_SYS_PLL1		1*		0
+SW2.3		CFG_SYS_PLL2		1*		0
+SW2.4		CFG_SYS_PLL3		1		0*
+SW2.5		CFG_CORE_PLL0		1*		0
+SW2.6		CFG_CORE_PLL1		1		0*
+SW2.7		CFG_CORE_PLL2		1*		0
+SW2.8		CFG_ROM_LOC1		1		0*
+
+SW3.1		CFG_HOST_AGT0		1*		0
+SW3.2		CFG_HOST_AGT1		1*		0
+SW3.3		CFG_HOST_AGT2		1*		0
+SW3.4		CFG_IO_PORTS0		1*		0
+SW3.5		CFG_IO_PORTS0		1		0*
+SW3.6		CFG_IO_PORTS0		1		0*
+
+SerDes CLK(MHz)		SW5.1		SW5.2
+----------------------------------------------
+25			0		0
+100*			1		0
+125			0		1
+200			1		1
+
+SerDes CLK spread	SW5.3		SW5.4
+----------------------------------------------
++/- 0.25%		0		0
+-0.50%			1		0
+-0.75%			0		1
+No Spread*		1		1
+
+SW4 settings are readable from the EPLD and are currently not used for
+any hardware settings (i.e. user configuration switches).
+
+	LEDs:
+
+Name		Desc.			ON		OFF
+------------------------------------------------------------------
+D13		PCI/PCI-X		PCI-X		PCI
+D14		3.3V PWR		3.3V		no power
+D15		SYSCLK			66MHz		33MHz
+
+
+	Default Memory Map:
+
+start		end		CS<n>	width	Desc.
+----------------------------------------------------------------------
+0000_0000	0fff_ffff	MCS0,1	64	DDR2 (256MB)
+f000_0000	f7ff_ffff	CS3,4	32	LB SDRAM (128MB)
+f800_0000	f8b0_1fff	CS5	-	EPLD
+fb80_0000	ff7f_ffff	CS6	32	SODIMM flash (64MB)
+ff80_0000	ffff_ffff	CS0	8	Boot flash (8MB)
+
+The EPLD on CS5 demuxes the following devices at the following offsets:
+
+offset		size	width	device
+--------------------------------------------------------
+0		1fff	8	7 segment display LED
+10_0000		1fff	4	user switches
+30_0000		1fff	4	HW Rev. register
+b0_0000		1fff	8	8kB EEPROM