Re: [microblaze-uclinux] MTD and JFFS with BigEndian uClinux syst ems

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Falk,

Brettschneider Falk wrote:
> Hi,
> 
> John Williams wrote:
> 
>>Nope, JFFS2 on MTD definitely works - we had a PetaLogix customer
>>putting a 50MB JFFS2 filesystem on an MTD partition, no problem.  We
>>were creating large files, copying, moving, deleting, the works.
> 
> This information helped me a lot, gave me the direction the drivers are all
> OK.

In several years of working on the kernel, I think I can count on one
hand (one finger?) the number of times a problem I've experienced has
been due to errors in standard kernel code.

It's a humbling lesson, but a valuable one.  99.9% of the time, it's
your fault!

> So we fixed our memory controller interface to be Linux-conform concerning
> the Endianess and word order, 

Ah, the luxury of FPGA-based development!

> and I checked the Kernel compilation options
> for MTD again where I found the 'CFI cmd/query byte swapping' thing in the
> advanced options, I had to switch it on. 

Well spotted - thanks for reporting the solution, it will no doubt help
someone in future via the archives.

> Well, now it seems to works
> perfectly, even with no change in the MTD driver sources. I can read/write
> files to the jffs2 file system. Thanks for all who listened and helped,
> especially John Williams. :-)

You're welcome, I'm glad it was useful.

John

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