1By Thomas.Lange@corelatus.se 2004-Oct-05 2---------------------------------------- 3DbAu1xx0 are development boards from AMD containing 4an Alchemy AU1xx0 series cpu with mips32 core. 5Existing cpu:s are Au1000, Au1100, Au1500 and Au1550 6 7Limitations & comments 8---------------------- 9Support was originally big endian only. 10I have not tested, but several u-boot users report working 11configurations in little endian mode. 12 13I named the board dbau1x00, to allow 14support for all three development boards 15( dbau1000, dbau1100 and dbau1500 ). 16Now there is a new board called dbau1550 also, which 17should be supported RSN. 18 19I only have a dbau1000, so my testing is limited 20to this board. 21 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 25boot loader delivered with board. 26 27NOTE! When you switch between the two boot flashes, the 28base addresses will be swapped. 29Have this in mind when you compile u-boot. CONFIG_SYS_TEXT_BASE has 30to match the address where u-boot is located when you 31actually launch. 32 33Ethernet only supported for mac0. 34 35PCMCIA only supported for slot 0, only 3.3V. 36 37PCMCIA IDE tested with Sandisk Compact Flash and 38IBM 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 45PCMCIA and running cpu in big endian mode!!!! 46 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... 64