100 lines
3.9 KiB
Plaintext
100 lines
3.9 KiB
Plaintext
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U-Boot for Wind River SBC834x Boards
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====================================
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The Wind River SBC834x board is a 6U form factor (not CPCI) reference
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design that uses the MPC8347E or MPC8349E processor. U-Boot support
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for this board is heavily based on the existing U-Boot support for
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Freescale MPC8349 reference boards.
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Support has been primarily tested on the SBC8349 version of the board,
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although earlier versions were also tested on the SBC8347. The primary
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difference in the two is the level of PCI functionality.
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http://www.windriver.com/products/OCD/SBC8347E_49E/
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Flash Details:
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==============
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The flash type is intel 28F640Jx (4096x16) [one device]. Base address
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is 0xFF80_0000 which is also where the Hardware Reset Configuration
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Word (HRCW) is stored. Caution should be used to not overwrite the
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HRCW, or "CF RCW" with a Wind River ICE will be required to restore
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the HRCW and allow the board to enter background mode for further
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steps in the flash process.
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Restoring a corrupted or missing flash image:
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=============================================
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Details for storing U-boot to flash using a Wind River ICE can be found
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on page 19 of the board manual (request ERG-00328-001). The following
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is a summary of that information:
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- Connect ICE and establish connection to it from WorkBench/OCD.
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- Ensure you have background mode (BKM) in the OCD terminal window.
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- Select the appropriate flash type (listed above)
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- Prepare a u-boot image by using the Wind River Convert utility;
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by using "Convert and Add file" on the ELF file from your build.
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Convert from FFF0_0000 to FFFF_FFFF (or to FFF3_FFFF if you are
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trying to preserve your old environment settings).
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- Set the start address of the erase/flash process to FFF0_0000
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- Set the target RAM required to 64kB.
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- Select sectors for erasing (see note on enviroment below)
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- Select Erase and Reprogram.
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Note that some versions of the register files used with Workbench
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would zero some TSEC registers, which inhibits ethernet operation
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by u-boot when this register file is played to the target. Using
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"INN" in the OCD terminal window instead of "IN" before the "GO"
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will not play the register file, and allow u-boot to use the TSEC
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interface while executed from the ICE "GO" command.
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Alternatively, you can locate the register file which will be named
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WRS_SBC8349_PCT00328001.reg or similar) and "REM" out all the lines
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beginning with "SCGA TSEC1" and "SCGA TSEC2". This allows you to
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use all the remaining register file content.
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If you wish to preserve your prior U-Boot environment settings,
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then convert (and erase to) 0xFFF3FFFF instead of 0xFFFFFFFF.
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The size for converting (and erasing) must be at least as large
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as u-boot.bin.
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Updating U-Boot with U-Boot:
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============================
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This procedure is very similar to other boards that have u-boot installed.
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Assuming that the network has been configured, and that the new u-boot.bin
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has been copied to the TFTP server, the commands are:
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tftp 200000 u-boot.bin
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protect off all
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erase fff00000 fff3ffff
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cp.b 200000 fff00000 3ffff
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protect on all
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PCI:
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====
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This board and U-Boot have been tested with PCI built in, on a SBC8349
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and confirmed that the "pci" command showed the intel e1000 that was
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present in the PCI slot. Note that if a 33MHz 32bit card is inserted
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in the slot, then the whole board will clock down to a 33MHz base
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clock instead of the default 66MHz. This will change the baud clocks
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and mess up your serial console output. If you want to use a 33MHz PCI
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card, then you should build a U-Boot with #undef PCI_66M in the
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include/configs/sbc8349.h and store this to flash prior to powering down
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the board and inserting the 33MHz PCI card.
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By default PCI support is disabled to better support very early
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revision MPC834x chips with possible PCI issues. Also PCI support is
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untested on the sbc8347 variants at this point in time.
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Paul Gortmaker, 01/2007
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