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ZedBoard Hardware Design Cannot use SD Card partition as root filesystem
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Related

Cannot use SD Card partition as root filesystem

Former Member
Former Member over 10 years ago

I am desperately trying to boot the last Xilinx Linux kernel on my rev. D ZedBoard with the root file system on the SD Card. Apparently there is a hardware problem:

mmc0: new high speed SDHC card at address 0007
mmcblk0: mmc0:0007 SD04G 3.70 GiB (ro)
mmcblk0: p1 p2
VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2): error -30
Please append a correct "root=" boot option; here are the available partitions:
b300         3887104 mmcblk0  driver: mmcblk
  b301          204800 mmcblk0p1 be93329c-01
  b302         3681280 mmcblk0p2 be93329c-02
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)

As can be seen in the log, the mmcblk0p2 partition is proposed as a valid available partition but the kernel could not open it... My bootargs (in device tree) specifies the rootwait option:

bootargs = "console=ttyPS0,115200 root=/dev/mmcblk0p2 rw rootwait earlyprintk";

but it seems to have no effect. Is there something wrong with the &sdhci0 entry of my device tree? I tried:

&sdhci0 {
tclock-frequency = <50000000>;
tstatus = "okay";
};

and:

&sdhci0 {
tstatus = "okay";
};

None worked. I tried with two other ZedBoards rev. C and... it worked. Is there something wrong with the rev. D?

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  • zedhed
    0 zedhed over 10 years ago

    Hi pacalet,

    The only change from Rev. C to Rev. D ZedBoard is a switchover from ES silicon to Zynq production silicon.

    Using a second SD card partition does work on older versions of the Linux kernel since we use this strategy to mount the rootfs from an EXT4 partition and this is how we run Ubuntu desktop in our reference designs.  I suspect that it is more likely that something has changed in the way the more recent Linux Kernel mmcblk driver initializes newly discovered SD cards.

    Regards,

    -Kevin

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  • Former Member
    0 Former Member over 10 years ago

    Thanks for your answer Kevin. What I don't understand is how this could just be a Linux kernel version problem: the same kernel works on rev. C but not on rev. D.

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  • Former Member
    0 Former Member over 10 years ago

    mmcblk0: mmc0:0007 SD04G 3.70 GiB (ro)

    "read only",why ???

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  • Former Member
    0 Former Member over 9 years ago

    Anyone have more updates on this?  I also am seeing the (ro) issue on boot with the latest 4.4 kernel ...

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  • Former Member
    0 Former Member over 9 years ago in reply to Former Member

    Aaaaand as soon as I posted this I saw that I had the xlconstant block set to 1 rather than 0 for the WP input on the PS7 on my BD ... so there that is.

    Hope fully that helps someone else.

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