| 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... |