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265817c7 WD |
1 | By Thomas.Lange@corelatus.se 2004-Oct-05 |
2 | ---------------------------------------- | |
3 | DbAu1xx0 are development boards from AMD containing | |
4 | an Alchemy AU1xx0 series cpu with mips32 core. | |
5 | Existing cpu:s are Au1000, Au1100, Au1500 and Au1550 | |
6 | ||
7 | Limitations & comments | |
8 | ---------------------- | |
9 | Support was originally big endian only. | |
10 | I have not tested, but several u-boot users report working | |
11 | configurations in little endian mode. | |
12 | ||
13 | I named the board dbau1x00, to allow | |
14 | support for all three development boards | |
15 | ( dbau1000, dbau1100 and dbau1500 ). | |
16 | Now there is a new board called dbau1550 also, which | |
17 | should be supported RSN. | |
18 | ||
19 | I only have a dbau1000, so my testing is limited | |
20 | to this board. | |
21 | ||
22 | The board has two different flash banks, that can | |
23 | be selected via dip switch. This makes it possible | |
24 | to test new bootloaders without thrashing the YAMON | |
25 | boot loader delivered with board. | |
26 | ||
27 | NOTE! When you switch between the two boot flashes, the | |
28 | base addresses will be swapped. | |
14d0a02a | 29 | Have this in mind when you compile u-boot. CONFIG_SYS_TEXT_BASE has |
265817c7 WD |
30 | to match the address where u-boot is located when you |
31 | actually launch. | |
32 | ||
33 | Ethernet only supported for mac0. | |
34 | ||
35 | PCMCIA only supported for slot 0, only 3.3V. | |
36 | ||
37 | PCMCIA IDE tested with Sandisk Compact Flash and | |
38 | IBM microdrive. | |
39 | ||
40 | ################################### | |
41 | ######## NOTE!!!!!! ######### | |
42 | ################################### | |
43 | If you partition a disk on another system (e.g. laptop), | |
44 | all bytes will be swapped on 16bit level when using | |
45 | PCMCIA and running cpu in big endian mode!!!! | |
46 | ||
47 | This is probably due to an error in Au1000 chip. | |
48 | ||
49 | Solution: | |
50 | ||
51 | a) Boot via network and partition disk directly from | |
52 | dbau1x00. The endian will then be correct. | |
53 | ||
54 | b) Partition disk on "laptop" and fill it with all files | |
55 | you need. Then write a simple program that endian swaps | |
56 | whole disk, | |
57 | ||
58 | Example: | |
59 | Original "laptop" byte order: | |
60 | B0 B1 B2 B3 B4 B5 B6 B7 B8 B9... | |
61 | ||
62 | Dbau1000 byte order will then be: | |
63 | B1 B0 B3 B2 B5 B4 B7 B6 B9 B8... |