projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 4cfaf55e | 1 | By Thomas.Lange@corelatus.se 2004-Oct-05 |
| 5da627a4 | 2 | ---------------------------------------- |
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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 | |
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6 | |
| 7 | Limitations & comments | |
| 8 | ---------------------- | |
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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. | |
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12 | |
| 13 | I named the board dbau1x00, to allow | |
| 14 | support for all three development boards | |
| 4cfaf55e | 15 | ( dbau1000, dbau1100 and dbau1500 ). |
| 8b74bf31 | 16 | Now there is a new board called dbau1550 also, which |
| 4cfaf55e | 17 | should be supported RSN. |
| 5da627a4 | 18 | |
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19 | I only have a dbau1000, so my testing is limited |
| 20 | to this board. | |
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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 | |
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25 | boot loader delivered with board. |
| 26 | ||
| 27 | NOTE! When you switch between the two boot flashes, the | |
| 8b74bf31 | 28 | base addresses will be swapped. |
| 14d0a02a | 29 | Have this in mind when you compile u-boot. CONFIG_SYS_TEXT_BASE has |
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30 | to match the address where u-boot is located when you |
| 31 | actually launch. | |
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32 | |
| 33 | Ethernet only supported for mac0. | |
| 34 | ||
| 4cfaf55e | 35 | PCMCIA only supported for slot 0, only 3.3V. |
| 5da627a4 | 36 | |
| 4cfaf55e | 37 | PCMCIA IDE tested with Sandisk Compact Flash and |
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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 | |
| 4cfaf55e | 45 | PCMCIA and running cpu in big endian mode!!!! |
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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... |