Leon,
On Thu, 27 Nov 2003, Leon KUKOVEC wrote:
Hey Ed,
table on a CF card without the bytes being swapped. This led me to wonder if anyone else was having these problems in little-endian mode or if it was just me.
I recently added PCMCIA support for PXA/WEPEP250 and have successfully used CompactFlash on it.
Congrats!
I don't know AU1500 processor, but the comment in cmd_ide.c says that processor swaps something automaticaly.
Paste: /* We only need to swap data if we are running on a big endian cpu. */ /* But Au1x00 cpu:s already swaps data in big endian mode! */ #if defined(__LITTLE_ENDIAN) || defined(CONFIG_AU1X00) #define input_swap_data(x,y,z) input_data(x,y,z) #else End of Paste
Yes, I saw that as well.
You will prolly know what has to be swapped and what not for AU1500.
This is, or was, the problem. I didn't know exactly what the problem was, mostly because of my own cofusion, but I still think it is a bug in the hardware, as Thomas pointed out earlier.
Our PXA runs in little endian mode and all I had to tweak was the following:
Convert PCMCIA Firmware Revision and Model Number into little endian because they are big endian strings and take care of lba_capacity which is little endian but has been swapped, which worked fine on big endian CPU's but on little endian, gave wrong number of sectors.
I have tweaked these as well for the Au1500, same problem as yours.
Everything else seemed to work fine.
What partition types are you using? I am trying to do a partition table with some linux and at least one FAT16 partition, but even without the FAT partition the system was showing a single partition as:
Partition Map for IDE device 0 -- Partition Type: DOS
Partition Start Sector Num Sectors Type 1 0 501760 f8
I poked around alot in disk/part_dos.c and found that if I remarked out the return after the check for PBR in print_partition_extended, then the rest of the partitions would print out:
Partition Map for IDE device 0 -- Partition Type: DOS
Partition Start Sector Num Sectors Type 1 0 501760 f8 1 32 4576 83 2 4608 4608 83 3 9216 492544 83
So this morning I started going through and figuring exactly what that meant. It appears that the first line shows up if the boot sector of the compact flash card has a DOS boot signature that is what you get. So apparently some idiot (probably me) at some point in time formated that CF card in a DOS machine with the /s option and it happily copied a DOS boot record into the beginning of the card. Boy do I feel stupid. So I popped the CF into a linux machine and typed "cat /dev/zero > /dev/hdg" re-ran fdisk to create my partitions, and now u-boot happily reports:
DbAu1x00 # ide part
Partition Map for IDE device 0 -- Partition Type: DOS
Partition Start Sector Num Sectors Type 1 32 4576 83 2 4608 4608 83 3 9216 492544 83 DbAu1x00 #
Which is what I wanted. I have been using #if defined(CONFIG_AU1X00) around my code mods, but it sounds like your changes and my changes are about the same in the end, so perhaps we should come up with another define for ENDIAN_CHALLENGED or something.
PS: I have verified it by using the same CompactFlash card on a PC and it works.
Hope that helps.
It helped a lot. Thanks. I guess the moral of the story is when you are having problems, make sure there isn't a short between the keyboard and the chair first. :)
Ed Okerson