Wolfgang,

I did not make myself clear enough. I have following your instructions about CF cards and U-Boot on your web site thank you very much it was a great help. I cannot read the Linux kernel using the command 'diskboot 200000 0:6' if would appear that when calculating the sector offset for this partition the calculation is off by 32 sectors I have yet to determine the significance of this as inside the extended partition the first Linux partition is offset by 32 sectors. But if I diskboot 200000 0:1 (or 0:2 or 0:3 all primary partitions) then all is well. I'm happy to provide debug output but I am not familiar enough with the DOS partition scheme to see the answer clearly but I'm on the steep learning curve.

Debug out below: U-Boot# ide part

Partition Map for IDE device 0 -- Partition Type: DOS

Partition Start Sector Num Sectors Type ide_read dev 0 start 0, blocks 1 buffer at 1F9FA38 Powersaving 00 1 32 2144 83 2 2176 2176 83 3 4352 5248 83 4 9600 115584 5 Extd ide_read dev 0 start 2580, blocks 1 buffer at 1F9F808 Powersaving 00 5 9632 7776 83 ide_read dev 0 start 4400, blocks 1 buffer at 1F9F5D8 Powersaving 00 6 17440 2144 83 ide_read dev 0 start 4C80, blocks 1 buffer at 1F9F3A8 Powersaving 00 7 19616 2144 83 ide_read dev 0 start 5500, blocks 1 buffer at 1F9F178 Powersaving 00 8 21792 5216 83 ide_read dev 0 start 6980, blocks 1 buffer at 1F9EF48 Powersaving 00 9 27040 7776 83 U-Boot# diskboot 200000 0:6 ide_read dev 0 start 0, blocks 1 buffer at 1F9F9E8 Powersaving 00 ide_read dev 0 start 2580, blocks 1 buffer at 1F9F7C0 Powersaving 00

Loading from IDE device 0, partition 6: Name: hda6 Type: U-Boot First Block: 17408, # of blocks: 2176, Block Size: 512 ide_read dev 0 start 4400, blocks 1 buffer at 200000 Powersaving 00

** Bad Magic Number ** U-Boot#

As you can see above from ide part partition 6 starts on sector 17440 but it would seem that diskboot is calculating the start sector as 17408. I'm about to compare the differences between ide part and diskboot and see if this produces any answers.

Regards, Rod Boyce

-----Original Message----- From: Wolfgang Denk [mailto:wd@denx.de] Sent: Wednesday, 22 January 2003 6:54 p.m. To: Rod Boyce Cc: 'u-boot-users@sourceforge.net' Subject: Re: [U-Boot-Users] Loading from a CF card on the PCMCIA interface

In message 8D7C5F56B409554D9D46AC22195807F3061C23@exchwenz01.dmcwave.co.nz you wrote:

I have a board with a compact flash device connected to the PCMCIA interface. I am trying to read the Linux kernel out from a Linux

partition

situated inside an extended partition.

Use a separate (small - 2 MB or so) partition to store the Linux kernel.

Has this been done before? I can use diskboot on a primary partition fine but not from an extended partition. Has anybody else done this before?

No. You would have to implement filesystem support to U-Boot.

But I would not like to see this integrated into U-Boot. If you want to do this, implement it as a U-Boot standalone application, that can be used as second stage boot loader.

Best regards,

Wolfgang Denk