MTD problem for Intel Flash

MTD problem for Intel Flash

[Shenrong]

Hi,

I met a problem when using JFFS2/MTD with Intel CFI Flash.I mount
JFFS2 fs on a MTD partition and copy a file to JFFS2 fs, then umount
the JFFS2 fs and reboot the system. The bootloader(PPCBoot) crashes
around the first instruction. I check the Flash with BDI, and find the Flash
in
the Status state(i.e. 0x00800080). The Intel CFI Flash is supported in file
cfi_cmdset_0001.c. After the read/write/erase operations, the Flash is not
reset to Ready state(what I think is for increasing the performance). This
doesn't
happen with AMD CFI Flash(impled in cfi_cmdset_0002.c). Even the umount
operation(with cfi_intelext_sync() called ) won't reset the Flash to Ready
state.
So run from Flash after reboot won't success except Hard reset.

I think the Flash should be reset to Ready state at least in
cfi_intelext_sync(), which
will be called whenever the MTD partition is closed. Maybe I have missed
sth.
Any ideas? Thanks.

Shenrong


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Re: MTD problem for Intel Flash

[Jaap-Jan Boor]

Hi Shenrong,

I have the same problem. I solved it by making a rather ugly
patch. I changed the 8xx reset vector code to first put flash
in Ready state (reset the flash state machine by writing 0x5050)

Jaap-Jan

>
> Hi,
>
> I met a problem when using JFFS2/MTD with Intel CFI Flash.I mount
> JFFS2 fs on a MTD partition and copy a file to JFFS2 fs, then umount
> the JFFS2 fs and reboot the system. The bootloader(PPCBoot) crashes
> around the first instruction. I check the Flash with BDI, and find the Flash
> in
> the Status state(i.e. 0x00800080). The Intel CFI Flash is supported in file
> cfi_cmdset_0001.c. After the read/write/erase operations, the Flash is not
> reset to Ready state(what I think is for increasing the performance). This
> doesn't
> happen with AMD CFI Flash(impled in cfi_cmdset_0002.c). Even the umount
> operation(with cfi_intelext_sync() called ) won't reset the Flash to Ready
> state.
> So run from Flash after reboot won't success except Hard reset.
>
> I think the Flash should be reset to Ready state at least in
> cfi_intelext_sync(), which
> will be called whenever the MTD partition is closed. Maybe I have missed
> sth.
> Any ideas? Thanks.
>
> Shenrong
>
>
>

---
J.G.J. Boor
Lucent Technologies Nederland b.v.	Room:  BE-525
Optical Networking Group TMS Data 	Phone: +31 (0)35 687 4721
Larenseweg 50, P.O. Box 1168, 		Fax:   +31 (0)35 687 5976
1200 BD, Hilversum, The Netherlands	mailto:jjboor@lucent.com


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