[Yaffs] Re: FW: RE: yaffs problem ?

[Charles Manning]

I agree with Nick as to what the problem most likely is.

The original EEC layout is part of the SmartMedia specification. It seems=
=20
though that the EEC in mtd (nand_ecc.c) generates the wrong byte ordering=
 for=20
the ECC bytes.=20

If you're using the ECC in YAFFS (yaffs_ecc.c) then you can configure it =
to=20
use the SmartMedia byte ordering (the "correct" one) or the mtd one (the=20
"wrong" one).  To get the same result as mtd you must set=20
CONFIG_YAFFS_ECC_WRONG_ORDER .


-- Charles

> > -----Original Message-----
> > From: zhengwei [mailto:jackzheng2002@sohu.com]
> > Sent: 14 November 2004 03:32
> > To: Nick Bane
> > Subject: Re: RE: yaffs problem ?
> >
> >
> >
> > Nick Bane,=C4=FA=BA=C3=A3=A1
> >
> > 	Ok=A3=ACThank you ! Do you have charles's email. I will contact
> > him for advice...
> > It's urgent for me to solve the problem.
> >     Thank you so much!
> >
> > =3D=3D=3D=3D=3D=3D=3D 2004-11-12 10:27:00 =C4=FA=D4=DA=C0=B4=D0=C5=D6=
=D0=D0=B4=B5=C0=A3=BA=3D=3D=3D=3D=3D=3D=3D
> >
> > >I think this may have to do with swapping or not the oob bytes
> >
> > for SmartMedia compatability. See the yaffs source.
> >
> > >There was a problem with #ifdef and #if in the file. I mentioned
> >
> > it to Charles and it is now ok in the current cvs
> >
> > >Nick
> > >
> > >> -----Original Message-----
> > >> From: jackzheng2002@sohu.com [mailto:jackzheng2002@sohu.com]
> > >> Sent: 12 November 2004 03:25
> > >> To: nick@cecomputing.co.uk
> > >> Subject: yaffs problem ?
> > >>
> > >>
> > >>
> > >>
> > >> Sir, Can you help me?
> > >> I don't use the MTD ECC, I use the yaffs itself ECC, and there
> > >> are some errors:
> > >> I don't know how to start? Thank you !!!!
> > >> Eager waiting for your response...
> > >>
> > >> Mounted devfs on /dev
> > >> Freeing init memory: 76K
> > >> zw: mount /etc as ramfs
> > >> zw: re-create the /etc/mtab entries
> > >> zw: /bin/mount -f -t cramfs -o remount,ro /dev/mtdblock/3 /
> > >> zw: /sbin/insmod -f /lib/yaffs.o
> > >> zw: /bin/mount -t yaffs /dev/mtdblock/4 /usr
> > >> yaffs: dev is 7940 name is "1f:04"
> > >> ecc_code : c3 ff 33 30 f3 3f
> > >> ecc_calc : ff c3 33 f3 30 3f
> > >> oob : 0 0 d0 ff ff ff 4 1 c3 ff 33 5c c1 30 f3 3f
> > >> nand_read_ecc: Failed ECC read, page 0x00002020
> > >> nand_read_ecc: Failed ECC read, page 0x00002020
> > >> ecc_code : c3 ff 33 30 f3 3f
> > >> ecc_calc : ff c3 33 f3 30 3f
> > >> oob : 0 0 e0 ff ff ff 4 1 c3 ff 33 50 c1 30 f3 3f
> > >> nand_read_ecc: Failed ECC read, page 0x00002022
> > >> nand_read_ecc: Failed ECC read, page 0x00002022
> > >> ecc_code : cc ff 3f 95 a6 ab
> > >> ecc_calc : ff cc 3f a6 95 ab
> > >> oob : 0 0 d0 ff ff ff 5 1 cc ff 3f d8 c1 95 a6 ab
> > >> nand_read_ecc: Failed ECC read, page 0x00002023
> > >> nand_read_ecc: Failed ECC read, page 0x00002023
> > >> ecc_code : cc ff 3f 96 a6 67
> > >> ecc_calc : ff cc 3f a6 96 67
> > >> oob : 0 0 e0 ff ff ff 5 1 cc ff 3f d4 c1 96 a6 67
> > >> nand_read_ecc: Failed ECC read, page 0x00002026
> > >> nand_read_ecc: Failed ECC read, page 0x00002026
> > >> ecc_code : c3 ff 33 65 aa 5b
> > >> ecc_calc : ff c3 33 aa 65 5b
> > >> oob : 0 0 d0 ff ff ff 4 1 c3 ff 33 5c c1 65 aa 5b
> > >> nand_read_ecc: Failed ECC read, page 0x00002027
> > >> nand_read_ecc: Failed ECC read, page 0x00002027
> > >> ecc_code : c3 ff 33 a5 a5 97
> > >> ecc_calc : ff c3 33 a5 a5 97
> > >> oob : 0 0 e0 ff ff ff 4 1 c3 ff 33 50 c1 a5 a5 97
> > >> nand_read_ecc: Failed ECC read, page 0x00002029
> > >> ecc_code : a9 aa 67 96 a6 67
> > >> ecc_calc : aa a9 67 a6 96 67
> > >> oob : 0 0 f0 ff ff ff 5 1 a9 aa 67 80 c1 96 a6 67
> > >> nand_read_ecc: Failed ECC read, page 0x0000202a
> > >> nand_read_ecc: Failed ECC read, page 0x0000202a
> > >> zw: exec /sbin/init
> > >> console=3D/dev/co?ole
> > >> init started:  BusyBox v0.60.3 (2002.05.13-08:36+0000) multi-c?l
> > >> binary Starting pid 22, console /dev/console: '/etc/init.d/rcS'
> > >> exec: /usr/etc/rc.local: No such file or dire?ory
> > >> Waiting for enter to start '/bin/sh' (pid 25, terminal /dev/consol=
e)
> > >>
> > >>
> > >> Please press Enter to activate this console.
> >
> > =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D=
 =3D =3D
> >
> >
> > =A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=D6=C2
> > =C0=F1=A3=A1
> >
> >
> > =A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1zhengwei
> > =A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1jackzheng2002@sohu.co=
m
> > =A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A12004-11-1=
2