Re: MTD: How to get actual image size from MTD partition

Hi Richard,

On Tue, 27 Jul 2021 at 18:16, Richard Weinberger
[off-list ref] wrote:

On Thu, Jul 22, 2021 at 1:11 PM Pintu Agarwal [off-list ref] wrote:

quoted

On Thu, 22 Jul 2021 at 02:24, Richard Weinberger [off-list ref] wrote:

quoted

----- Ursprüngliche Mail -----

quoted

quoted

But let me advertise ubiblock a second time.

Sorry, I could not understand about the ubiblock request. Is it
possible to elaborate little more ?
We are already using squashfs on top of our UBI volumes (including
rootfs mounting).
This is the kernel command line we pass:
rootfstype=squashfs root=/dev/mtdblock44 ubi.mtd=40,0,30
And CONFIG_MTD_UBI_BLOCK=y is already enabled in our kernel.
Do we need to do something different for ubiblock ?

From that command line I understand that you are *not* using squashfs on top of UBI.
You use mtdblock. ubiblock is a mechanism to turn an UBI volume into a read-only
block device.
See: http://www.linux-mtd.infradead.org/doc/ubi.html#L_ubiblock

[snip]

Ouch, so surprised that after all these years someone is doing squashfs/mtdblock
instead of using ubiblock :-)

Can we patch either Kconfig or add some warn_once on mtdblock
usage, suggesting to use ubiblock instead?

I remember there was still some use case(s) for mtdblock but I can't remember
now what was it, perhaps we should document the expectations?
(Is that for JFFS2 to mount?)

Thanks,
Ezequiel

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