[PATCH] Make the mtdblock read/write skip the bad nand sector

[Pavel Machek]

Hi!

> > Hi,
> > 
> >  > Thanks a lot for the insight. After reading this, I'm wondering what's
> >  > preventing us from killing MTD block support altogether. Artem, already
> >  > suggested it a while back...
> > 
> > People using squashfs/cramfs/readonly ext2/.. on a NOR flash?
> 
> And people who *still*, after all these years, don't realise that they
> don't actually need it to mount JFFS2. Even as the root file system
> (although they *do* need rootfstype=jffs2).

I must admit I'm such person...

I guess printk("...you don't really need mtdblock...") in jffs2's
mount code would probably improve that realisation...

This certainly does not help:

pavel at amd:/data/l/linux-n900$ grep -ri mtdblock  Documentation
Documentation/frv/booting.txt:	   exec -c "console=ttySM0,115200
ip=:::::dhcp root=/dev/mtdblock2 rw"
Documentation/frv/booting.txt:	 /dev/mtdblock3	Fourth RedBoot
partition on the System Flash
Documentation/arm/SA1100/Assabet:which is the third one.  Within
Linux, this correspond to /dev/mtdblock2.
Documentation/arm/SA1100/Assabet:	exec -b 0x100000 -l 0xc0000 -c
"root=/dev/mtdblock2"

(Should not mtdblock be at least in devices.txt file?)

BTW... is there documentation of mtdblock "translation layer"
somewhere? I realize it is very simple, but it does need to keep some
data?

I guess running jffs on regular block device (USB stick, SD card) is
not feasible?
								Pavel
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