Re: [Qemu-devel] hw/nand hw/onenand and read-only

[Peter Maydell]

On 18 October 2011 14:38, Markus Armbruster <address@hidden> wrote:
> Yes, that way works:
>
>    $ qemu-system-arm -drive if=mtd,file=tmp.qcow2,readonly
>    qemu-system-arm: -drive if=mtd,file=tmp.qcow2,readonly: readonly not 
> supported by this bus type
>
> But try this way:
>
>    $ qemu-system-arm -drive if=none,file=tmp.qcow2,readonly,id=foo -device 
> nand,drive=foo
>    Kernel image must be specified
>
> Grr, force it:
>
>    $ qemu-system-arm -drive if=none,file=tmp.qcow2,readonly,id=foo -device 
> nand,drive=foo -kernel /dev/null
>    qemu: hardware error: nand_device_init: Unsupported NAND block size.
>    [...]
>
> Note that I didn't bother supplying a drive with sensible size.  If I
> did, I guess I'd get nand coupled to a read-only drive.  Easy enough for
> you to try :)

Isn't this a block layer problem? It seems to be blockdev.c that
emits the "readonly not supported" message for MTD devices, so presumably
it ought to do so however the user sets up the device...

-- PMM