[U-Boot-Users] Question about NAND-Flash Support on MPC831x

[U-Boot-Users] Question about NAND-Flash Support on MPC831x

[Jens Gehrlein]

Hi,

on 2007-05-16 16:28:05 GMT, Scott Wood submitted a patch with the subject:
"[PATCH 2/2] NAND: Add mpc831x support."

I can't find this patch in any repository. Even, there wasn't any reply 
to his e-mail.

Was the patch rejected?
What's about the current state of NAND-Flash Support for MPC831x in 
U-Boot using the FCM concerning:
- Read/Write/Erase Access
- Booting from NAND

Thanks.

Best Regards
Jens

[U-Boot-Users] Question about NAND-Flash Support on MPC831x

[Stefan Roese]

On Wednesday 05 March 2008, Jens Gehrlein wrote:
> on 2007-05-16 16:28:05 GMT, Scott Wood submitted a patch with the subject:
> "[PATCH 2/2] NAND: Add mpc831x support."
>
> I can't find this patch in any repository. Even, there wasn't any reply
> to his e-mail.
>
> Was the patch rejected?

Yes it was rejected. IIRC, there were some issues with a new "interface" that 
was introduced to the NAND subsystem here (transparent hardware ECC). At that 
time such an "interface" was not supported in Linux either. Not sure what the 
current status here is.

Scott, whats the current status? Has this support now been included to Linux 
meanwhile? How should we continue here? Do you plan on resubmitting patches 
for FSL NAND support? Please keep in mind that we still plan to switch to the 
new U-Boot NAND subsystem rewrite done a few months ago, based on the Linux 
2.6.22 MTD sources.

> What's about the current state of NAND-Flash Support for MPC831x in
> U-Boot using the FCM concerning:
> - Read/Write/Erase Access
> - Booting from NAND

No idea. Scott?

Best regards,
Stefan

=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================

[U-Boot-Users] Question about NAND-Flash Support on MPC831x

[Scott Wood]

Stefan Roese wrote:
> On Wednesday 05 March 2008, Jens Gehrlein wrote:
>> on 2007-05-16 16:28:05 GMT, Scott Wood submitted a patch with the subject:
>> "[PATCH 2/2] NAND: Add mpc831x support."
>>
>> I can't find this patch in any repository. Even, there wasn't any reply
>> to his e-mail.
>>
>> Was the patch rejected?
> 
> Yes it was rejected. IIRC, there were some issues with a new "interface" that 
> was introduced to the NAND subsystem here (transparent hardware ECC). At that 
> time such an "interface" was not supported in Linux either. Not sure what the 
> current status here is.
> 
> Scott, whats the current status? Has this support now been included to Linux 
> meanwhile? How should we continue here? Do you plan on resubmitting patches 
> for FSL NAND support? Please keep in mind that we still plan to switch to the 
> new U-Boot NAND subsystem rewrite done a few months ago, based on the Linux 
> 2.6.22 MTD sources.

I recently got the Linux version of the driver merged; the newer Linux 
NAND subsystem code doesn't need all of the previous patches I sent for 
u-boot, though if you're basing off of 2.6.22 you'll need a couple 
patches that went in more recently than that (78b65179 Don't panic... 
and 1c45f604 Fix misparenthesization...).

>> What's about the current state of NAND-Flash Support for MPC831x in
>> U-Boot using the FCM concerning:
>> - Read/Write/Erase Access

I'll try to get a new patch for this out soon.

>> - Booting from NAND

There's an un-cleaned-up patch from the BSP sitting around on my hard 
disk...  It's a rather intrusive patch (mostly due to the need to get 
RAM going with only 4K of code), so it'll need some looking over before 
I submit.  Not likely for the upcoming merge window, but maybe the next 
one if my schedule permits.

-Scott

[U-Boot-Users] Question about NAND-Flash Support on MPC831x

[Stefan Roese]

On Wednesday 05 March 2008, Scott Wood wrote:
> > Scott, whats the current status? Has this support now been included to
> > Linux meanwhile? How should we continue here? Do you plan on resubmitting
> > patches for FSL NAND support? Please keep in mind that we still plan to
> > switch to the new U-Boot NAND subsystem rewrite done a few months ago,
> > based on the Linux 2.6.22 MTD sources.
>
> I recently got the Linux version of the driver merged; the newer Linux
> NAND subsystem code doesn't need all of the previous patches I sent for
> u-boot, though if you're basing off of 2.6.22 you'll need a couple
> patches that went in more recently than that (78b65179 Don't panic...
> and 1c45f604 Fix misparenthesization...).

Patches welcome. :)

> >> What's about the current state of NAND-Flash Support for MPC831x in
> >> U-Boot using the FCM concerning:
> >> - Read/Write/Erase Access
>
> I'll try to get a new patch for this out soon.

Thanks.

> >> - Booting from NAND
>
> There's an un-cleaned-up patch from the BSP sitting around on my hard
> disk...  It's a rather intrusive patch (mostly due to the need to get
> RAM going with only 4K of code), so it'll need some looking over before
> I submit.

Please try to integrate such NAND booting stuff into the already existing 
nand_spl framework.

Best regards,
Stefan

=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================