[Buildroot] buildroot with SquashFS root file system
Michael S. Zick
minimod at morethan.org
Tue Dec 6 15:56:05 UTC 2011
On Tue December 6 2011, Emmanuel BOUAZIZ wrote:
>
> Hi,
>
> I'm trying to run buildroot 2011.11 on an atom based board, booting via PXE.
>
> I've selected the SquashFS 4.x root filesystem (xz compressed), bzImage as the Kernel binary format, and
> syslinux/pxelinux as the bootloader.
> In the system configuration, I checked "remount root filesystem read-write during boot"
>
> In the kernel configuration, I checked Initial RAM filesystem and RAM disk support+XZ, and SquashFS/XZ filesystem support.
>
> On the PXE server, I put these kernel parameters: append vga=0x305 fbcon=scrollback:4096k initrd=rootfs.squashfs
>
> Here is what I get during the boot sequence:
>
> (...)
> RAMDISK: squashfs filesystem found at block 0
> RAMDISK: Loading 14133KiB [1 disk] into ram disk.../
> usb 1-7: new high speed USB device number 3 using ehci_hcd
> VFS: Mounted root (squashfs filesystem) readonly on device 1:0
> usb 2-2: new full speed USB device number 2 using uhci_hcd
> can't open /dev/null: No such file or directory
> can't open /dev/null: No such file or directory
> can't open /dev/null: No such file or directory
> can't open /dev/null: No such file or directory
> can't open /dev/null: No such file or directory
> can't open /dev/null: No such file or directory
> Starting logging: OK
> Starting mdev...
> mdev: /sys/class: No such file or directory
> Starting network...
> hub 2-2:1.0: USB found
> hub 2-2:1.0: 3 ports detected
> ifup: can't open '/var/run/ifstate': Read-only file system
> (...)
>
> I get the exact same result if I try to use a cramfs instead of a SquashFS.
>
> Oddly enough, it works perfectly with a cpio root filesystem, or when I integrate the root filesystem as an initramfs in
> the kernel image.
>
> I probably missed an important item, but can't figure which.
> Any help appreciated.
>
SquashFS is a read-only file system.
So which of the "device support" options did you choose?
You'll need one that puts devices in something writable, like tmpfs.
Mike
> Thanks,
>
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