Hi Bob, On Sun, 2009-08-09 at 17:22 -0700, Bob Furber wrote: > I am not sure where to turn on this baffling problem. > > It seems that ext2fs partition layout or information on 2GB SD cards has > changed over time. > > I have been using an old Fedora Linux PC (Fedora Core 2.6.15) to > partition SD cards and load uClinux onto them and our SBCs are quite > happy booting uClinux from these cards; even 2GB SD cards. > > The problem started when we started using a new Ubuntu LinuxPC (2.6.27). > Our SBCs are quite happy booting uClinux from these cards ..EXCEPT for > 2GB SD cards. > > A SD card partitioned on the old Fedora Linux PC is unreadable on the > new UbuntuPC > A SD card partitioned on the UbuntuPC is READABLE on the old Fedora > Linux PC > Our SBCs cannot find /boot/linix.bin on a 2GB SD card prepared > (partitioned & loaded with uClinux) on the new UbuntuPC > Our SBCs CAN find /boot/linix.bin on a 256MB SD card prepared on the new > UbuntuPC > Our SBCs CAN find /boot/linix.bin on a 2GB SD card prepared on the old > Fedora Linux PC > > And, yes, the same scripts are used on both Linux PCs and we have taken > into account the csd.rd_bl_len kludge used by 2GB SD cards to represent > the greater capacity. This is why 2GB SD cards loaded on our old Fedora > Linux PC happily boot on our PCs. > > The SBCs use a modified dBUG monitor to boot uClinux from an SD card. > The modifications to dBUG were carried out in 2005 and consisted of > adding some SD card APIs and files lifted from U-boot and massaged: > cmd_ext2.c, ext2fs.c, dev.c, part.c & part_dos.c. > > Has anyone come across this problem? > > Thanks, > > Bob Furber > > > > > _______________________________________________ > uClinux-dev mailing list > uClinux-dev@uclinux.org > http://mailman.uclinux.org/mailman/listinfo/uclinux-dev > This message was resent by uclinux-dev@uclinux.org > To unsubscribe see: > http://mailman.uclinux.org/mailman/options/uclinux-dev
I can't really give any specific help other than what you already tried, but I have been in a similar situation. I got some Olin 2 GB cards a little while ago and existing firmware I had running (using SPI) totally refused to run properly. Like you, I allowed the "hack" on the block length in CSD. My good old trusty card reader doesn't like the cards either. I spent a bit of time stepping around further in my code but I never pinned it down as to where these 2 GB cards went to lala land. I gave up I must say... too irritating. A look at the card vendor's URL revealed they expect the consumer to buy "their" card reader products, which of course is a joke. The last I checked, the consensus is/was that the 2 GB cards arena is a big mess. Apparently, more don't work than ones that actually do.... Seemed to me might as well move to HC... ? I certainly appreciate/sympathise - I found it very irritating to say the least : These cards are sold with the SD spec logo - but they don't __comply__ !!! -- Best regards, Kris _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
