Re: Writing to AT24C64C EEPROM fails on RHEL based kernels

[Munir Bandukwala <munirb-DUeqMYwuH4dWk0Htik3J/w@public.gmane.org>]

Thanks Wolfram for your response, my comments are inline ...

On 03/07/2011 11:48 AM, Wolfram Sang wrote:
>> While looking for patches, I came accross
>> https://bugzilla.redhat.com/show_bug.cgi?id=182687 and adding an extra delay
>> in the piix4_transaction function fixes the problem for me as well.
> So, this is not a problem anymore if I understand you correctly?
>
yes thats correct, I have to add a delay for the chip on my box (its not 
the same as the one used in the patch above) and it works, what I was 
wondering was why ubuntu/2.6.35 works without the additional delay or 
any changes to code.
>> I think the problems are related, but any pointers would be appreciated. I am
>> pasting information about my machine, please let me know if you guys needs
>> any more information
> This seems normal to me. The eeprom needs time to write the data. Any reasons
> for not using the in-kernel eeprom driver (drivers/misc/eeprom/at24.c)? It
> deals with all of that (and probably more).
>
I did try the at24 driver and had a similar issue, for ease of testing 
and comparing different kernels, I switched to the user space code.
> Regards,
>
>     Wolfram
>