mpc83xx: U-Boot support for Wind River SBC8349

I've redone the SBC8349 support to match git-current, which
incorporates all the MPC834x updates from Freescale since the 1.1.6
release,  including the DDR changes.

I've kept all the SBC8349 files as parallel as possible to the
MPC8349EMDS ones for ease of maintenance and to allow for easy
inspection of what was changed to support this board.  Hence the SBC8349
U-Boot has FDT support and everything else that the MPC8349EMDS has.

Fortunately the Freescale updates added support for boards using CS0,
but I had to change spd_sdram.c to allow for board specific settings for
the sdram_clk_cntl (it is/was hard coded to zero, and that remains the
default if the board doesn't specify a value.)

Hopefully this should be mergeable as-is and require no whitespace
cleanups or similar, but if something doesn't measure up then let me
know and I'll fix it.

Thanks,
Paul.

1 files changed, 99 insertions, 0 deletions

diff --git a/doc/README.sbc8349 b/doc/README.sbc8349
new file mode 100644
index 00000000000..a0ac6388d60
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+
+
+	U-Boot for Wind River SBC834x Boards
+	====================================
+
+
+The Wind River SBC834x board is a 6U form factor (not CPCI) reference
+design that uses the MPC8347E or MPC8349E processor.  U-Boot support
+for this board is heavily based on the existing U-Boot support for
+Freescale MPC8349 reference boards.
+
+Support has been primarily tested on the SBC8349 version of the board,
+although earlier versions were also tested on the SBC8347.  The primary
+difference in the two is the level of PCI functionality.
+
+	http://www.windriver.com/products/OCD/SBC8347E_49E/
+
+
+Flash Details:
+==============
+
+The flash type is intel 28F640Jx (4096x16) [one device].  Base address
+is 0xFF80_0000 which is also where the Hardware Reset Configuration
+Word (HRCW) is stored.  Caution should be used to not overwrite the
+HRCW, or "CF RCW" with a Wind River ICE will be required to restore
+the HRCW and allow the board to enter background mode for further
+steps in the flash process.
+
+
+Restoring a corrupted or missing flash image:
+=============================================
+
+Details for storing U-boot to flash using a Wind River ICE can be found
+on page 19 of the board manual (request ERG-00328-001).  The following
+is a summary of that information:
+
+  - Connect ICE and establish connection to it from WorkBench/OCD.
+  - Ensure you have background mode (BKM) in the OCD terminal window.
+  - Select the appropriate flash type (listed above)
+  - Prepare a u-boot image by using the Wind River Convert utility;
+    by using "Convert and Add file" on the ELF file from your build.
+    Convert from FFF0_0000 to FFFF_FFFF (or to FFF3_FFFF if you are
+    trying to preserve your old environment settings).
+  - Set the start address of the erase/flash process to FFF0_0000
+  - Set the target RAM required to 64kB.
+  - Select sectors for erasing (see note on enviroment below)
+  - Select Erase and Reprogram.
+
+Note that some versions of the register files used with Workbench
+would zero some TSEC registers, which inhibits ethernet operation
+by u-boot when this register file is played to the target.  Using
+"INN" in the OCD terminal window instead of "IN" before the "GO"
+will not play the register file, and allow u-boot to use the TSEC
+interface while executed from the ICE "GO" command.
+
+Alternatively, you can locate the register file which will be named
+WRS_SBC8349_PCT00328001.reg or similar) and "REM" out all the lines
+beginning with "SCGA TSEC1" and "SCGA TSEC2".  This allows you to
+use all the remaining register file content.
+
+If you wish to preserve your prior U-Boot environment settings,
+then convert (and erase to) 0xFFF3FFFF instead of 0xFFFFFFFF.
+The size for converting (and erasing) must be at least as large
+as u-boot.bin.
+
+
+Updating U-Boot with U-Boot:
+============================
+
+This procedure is very similar to other boards that have u-boot installed.
+Assuming that the network has been configured, and that the new u-boot.bin
+has been copied to the TFTP server, the commands are:
+
+	tftp 200000 u-boot.bin
+	protect off all
+	erase fff00000 fff3ffff
+	cp.b 200000 fff00000 3ffff
+	protect on all
+
+
+PCI:
+====
+
+This board and U-Boot have been tested with PCI built in, on a SBC8349
+and confirmed that the "pci" command showed the intel e1000 that was
+present in the PCI slot.  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 want to use a 33MHz PCI
+card, then you should build a U-Boot with #undef PCI_66M in the
+include/configs/sbc8349.h and store this to flash prior to powering down
+the board and inserting the 33MHz PCI card.
+
+By default PCI support is disabled to better support very early
+revision MPC834x chips with possible PCI issues.  Also PCI support is
+untested on the sbc8347 variants at this point in time.
+
+
+						Paul Gortmaker, 01/2007