[meta-xilinx] Cannot load VFS from SDCard partitioned using wic

Mon Feb 26 02:04:21 PST 2018

Hi Giordon,

I experienced similar issues. I found a solution on the Xilinx forums.
As mentioned, mounting using ro should get it to boot, but you may get other problems. It should get you to the login though.

See this post, as it may need to disable write protect on the SD card. This solved it for me and I could then mount it as rw.

https://forums.xilinx.com/t5/Embedded-Linux/ZynqMP-SD-card-is-write-protect/td-p/787118

Thanks,

Richard.

-----Original Message-----
From: meta-xilinx-bounces at yoctoproject.org [mailto:meta-xilinx-bounces at yoctoproject.org] On Behalf Of Nathan Rossi
Sent: 26 February 2018 09:24
To: Giordon Stark
Cc: meta-xilinx at yoctoproject.org
Subject: Re: [meta-xilinx] Cannot load VFS from SDCard partitioned using wic

On 26 February 2018 at 06:34, Giordon Stark <kratsg at gmail.com> wrote:
> Hi all, I'm using a zynqmp 102 chip:
>
> I used the wic file created to flash an SD card using dd. I also
> copied system.dtb and created a BOOT.bin to copy into the first (boot) partition.
> However, the SD card seems readable, and shows the right partitions..
> but I still cannot get the kernel to load the FS from it?
>
> Any ideas?
>
> [    6.983061] Waiting for root device /dev/mmcblk0p2...
> [    7.244076] mmc0: new high speed SDXC card at address 59b4
> [    7.249846] mmcblk0: mmc0:59b4 SD    58.9 GiB (ro)

Its mounted read only. Check the card, and the preceding log (there might be information regarding why it was mounted read only).

> [    7.255864]  mmcblk0: p1 p2
> [    7.341815] VFS: Cannot open root device "mmcblk0p2" or
> unknown-block(179,2): error -30

Error read only. If you want to mount it read only make sure to pass the "ro" flag in your boot args.

Regards,
Nathan

> [    7.349751] Please append a correct "root=" boot option; here are the
> available partitions:
> [    7.358115] 0100           65536 ram0 [    7.361627]  (driver?)
> [    7.363996] 0101           65536 ram1 [    7.367529]  (driver?)
> [    7.369880] 0102           65536 ram2 [    7.373446]  (driver?)
> [    7.375782] 0103           65536 ram3 [    7.379334]  (driver?)
> [    7.381697] 0104           65536 ram4 [    7.385236]  (driver?)
> [    7.387587] 0105           65536 ram5 [    7.391139]  (driver?)
> [    7.393503] 0106           65536 ram6 [    7.397041]  (driver?)
> [    7.399392] 0107           65536 ram7 [    7.402956]  (driver?)
> [    7.405295] 0108           65536 ram8 [    7.408846]  (driver?)
> [    7.411196] 0109           65536 ram9 [    7.414762]  (driver?)
> [    7.417100] 010a           65536 ram10 [    7.420738]  (driver?)
> [    7.423100] 010b           65536 ram11 [    7.426727]  (driver?)
> [    7.429078] 010c           65536 ram12 [    7.432727]  (driver?)
> [    7.435067] 010d           65536 ram13 [    7.438706]  (driver?)
> [    7.441056] 010e           65536 ram14 [    7.444706]  (driver?)
> [    7.447046] 010f           65536 ram15 [    7.450684]  (driver?)
> [    7.453051] b300        61766656 mmcblk0 [    7.456848]  driver: mmcblk
> [    7.459632]   b301           31159 mmcblk0p1 22568d5b-01[    7.464767]
> [    7.466227]   b302          161078 mmcblk0p2 22568d5b-02[    7.471344]
> [    7.472837] Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(179,2)
> [    7.481257] CPU: 3 PID: 1 Comm: swapper/0 Not tainted
> 4.9.0-xilinx-v2017.1 #1
> [    7.488364] Hardware name: xlnx,zynqmp (DT)
> [    7.492528] Call trace:
> [    7.494965] [<ffffff8008088440>] dump_backtrace+0x0/0x198
> [    7.500345] [<ffffff80080885ec>] show_stack+0x14/0x20
> [    7.505379] [<ffffff80083e7f70>] dump_stack+0x90/0xb0
> [    7.510414] [<ffffff800813461c>] panic+0x110/0x258
> [    7.515188] [<ffffff8008c210f4>] mount_block_root+0x198/0x270
> [    7.520916] [<ffffff8008c21408>] mount_root+0x11c/0x134
> [    7.526123] [<ffffff8008c21590>] prepare_namespace+0x170/0x1b8
> [    7.531939] [<ffffff8008c20d20>] kernel_init_freeable+0x1c0/0x1e0
> [    7.538016] [<ffffff800892d690>] kernel_init+0x10/0x100
> [    7.543223] [<ffffff8008082e80>] ret_from_fork+0x10/0x50
> [    7.548516] SMP: stopping secondary CPUs
> [    7.585970] Kernel Offset: disabled
> [    7.589380] Memory Limit: none
> [    7.592425] ---[ end Kernel panic - not syncing: VFS: Unable to mount
> root fs on unknown-block(179,2)
>
> --
> Giordon Stark
>
> --
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