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wdenk4cfaf552004-10-11 23:03:10 +00001By Thomas.Lange@corelatus.se 2004-Oct-05
wdenk5da627a2003-10-09 20:09:04 +00002----------------------------------------
wdenk4cfaf552004-10-11 23:03:10 +00003DbAu1xx0 are development boards from AMD containing
4an Alchemy AU1xx0 series cpu with mips32 core.
5Existing cpu:s are Au1000, Au1100, Au1500 and Au1550
wdenk5da627a2003-10-09 20:09:04 +00006
7Limitations & comments
8----------------------
wdenk4cfaf552004-10-11 23:03:10 +00009Support was originally big endian only.
10I have not tested, but several u-boot users report working
11configurations in little endian mode.
wdenk5da627a2003-10-09 20:09:04 +000012
13I named the board dbau1x00, to allow
14support for all three development boards
wdenk4cfaf552004-10-11 23:03:10 +000015( dbau1000, dbau1100 and dbau1500 ).
wdenk8b74bf32004-10-11 23:10:30 +000016Now there is a new board called dbau1550 also, which
wdenk4cfaf552004-10-11 23:03:10 +000017should be supported RSN.
wdenk5da627a2003-10-09 20:09:04 +000018
wdenk4cfaf552004-10-11 23:03:10 +000019I only have a dbau1000, so my testing is limited
20to this board.
wdenk5da627a2003-10-09 20:09:04 +000021
22The board has two different flash banks, that can
23be selected via dip switch. This makes it possible
24to test new bootloaders without thrashing the YAMON
wdenk4cfaf552004-10-11 23:03:10 +000025boot loader delivered with board.
26
27NOTE! When you switch between the two boot flashes, the
wdenk8b74bf32004-10-11 23:10:30 +000028base addresses will be swapped.
Wolfgang Denk14d0a022010-10-07 21:51:12 +020029Have this in mind when you compile u-boot. CONFIG_SYS_TEXT_BASE has
wdenk8b74bf32004-10-11 23:10:30 +000030to match the address where u-boot is located when you
31actually launch.
wdenk5da627a2003-10-09 20:09:04 +000032
33Ethernet only supported for mac0.
34
wdenk4cfaf552004-10-11 23:03:10 +000035PCMCIA only supported for slot 0, only 3.3V.
wdenk5da627a2003-10-09 20:09:04 +000036
wdenk4cfaf552004-10-11 23:03:10 +000037PCMCIA IDE tested with Sandisk Compact Flash and
wdenk5da627a2003-10-09 20:09:04 +000038IBM microdrive.
39
40###################################
41######## NOTE!!!!!! #########
42###################################
43If you partition a disk on another system (e.g. laptop),
44all bytes will be swapped on 16bit level when using
wdenk4cfaf552004-10-11 23:03:10 +000045PCMCIA and running cpu in big endian mode!!!!
wdenk5da627a2003-10-09 20:09:04 +000046
47This is probably due to an error in Au1000 chip.
48
49Solution:
50
51a) Boot via network and partition disk directly from
52dbau1x00. The endian will then be correct.
53
54b) Partition disk on "laptop" and fill it with all files
55you need. Then write a simple program that endian swaps
56whole disk,
57
58Example:
59Original "laptop" byte order:
60B0 B1 B2 B3 B4 B5 B6 B7 B8 B9...
61
62Dbau1000 byte order will then be:
63B1 B0 B3 B2 B5 B4 B7 B6 B9 B8...