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[kvmfornfv.git] / qemu / roms / u-boot / board / pb1x00 / README

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+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...