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- By Thomas.Lange@corelatus.se 2004-Oct-05
- ----------------------------------------
- DbAu1xx0 are development boards from AMD containing
- an Alchemy AU1xx0 series cpu with mips32 core.
- Existing cpu:s are Au1000, Au1100, Au1500 and Au1550
- Limitations & comments
- ----------------------
- Support was originally big endian only.
- I have not tested, but several u-boot users report working
- configurations in little endian mode.
- I named the board dbau1x00, to allow
- support for all three development boards
- ( dbau1000, dbau1100 and dbau1500 ).
- Now there is a new board called dbau1550 also, which
- should be supported RSN.
- I only have a dbau1000, so my testing is limited
- to this board.
- The board has two different flash banks, that can
- be selected via dip switch. This makes it possible
- to test new bootloaders without thrashing the YAMON
- boot loader delivered with board.
- NOTE! When you switch between the two boot flashes, the
- base addresses will be swapped.
- Have this in mind when you compile u-boot. CONFIG_SYS_TEXT_BASE has
- to match the address where u-boot is located when you
- actually launch.
- Ethernet only supported for mac0.
- PCMCIA only supported for slot 0, only 3.3V.
- PCMCIA IDE tested with Sandisk Compact Flash and
- IBM microdrive.
- ###################################
- ######## NOTE!!!!!! #########
- ###################################
- If you partition a disk on another system (e.g. laptop),
- all bytes will be swapped on 16bit level when using
- PCMCIA and running cpu in big endian mode!!!!
- This is probably due to an error in Au1000 chip.
- Solution:
- a) Boot via network and partition disk directly from
- dbau1x00. The endian will then be correct.
- b) Partition disk on "laptop" and fill it with all files
- you need. Then write a simple program that endian swaps
- whole disk,
- Example:
- Original "laptop" byte order:
- B0 B1 B2 B3 B4 B5 B6 B7 B8 B9...
- Dbau1000 byte order will then be:
- B1 B0 B3 B2 B5 B4 B7 B6 B9 B8...
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