[U-Boot] nand onfi 8bit/16bit bus support

[Michal Simek <monstr@monstr.eu>]

On 06/19/2013 07:17 PM, Scott Wood wrote:
> On 06/19/2013 08:40:19 AM, Michal Simek wrote:
>> Hi Scott,
>>
>> On 05/09/2013 11:37 PM, Scott Wood wrote:
>> > On 05/06/2013 11:53:52 AM, Michal Simek wrote:
>> >> Hi guys,
>> >>
>> >> Zynq supports 8 and 16bit ONFI nand flashes.
>> >> We can count number of connected pins and from that
>> >> we know if 8bit or 16bit nand flash is used.
>> >>
>> >> I have looked at the code and contains ONFI detection
>> >> with correct detection of bus width + checking later.
>> >> Why also not setup proper chip->options for NAND_BUSWIDTH_16?
>> >>
>> >> Not sure how others but if driver expect just ONFI devices
>> >> and support 8 and 16bit options why not just to setup
>> >> chip options based on information from ONFI or
>> >> not check that (busw != (chip->options & NAND_BUSWIDTH_16))
>> >> for onfi case.
>> >
>> > This is fixed in current Linux, with NAND_BUSWIDTH_AUTO.  There was a patchset to merge in recent Linux MTD code a while back, but an expected respin didn't come.  I'll try to fix it up when I process this merge window's patches.
>>
>> Have you done this change?
>> I have grepped the latest version and I can't see it there.
> 
> MTD from 3.7.1 (which was what was current when the patch was posted months ago) was merged in.  
> It looks like NAND_BUSWIDTH_AUTO was added in 3.8.  We can do another MTD update in the next merge window,
> which would pick this up.  Or if you'd like to submit a patch that just fixes this problem 
> (in the same way as in Linux, so it doesn't conflict too badly when we do the merge), it could be applied now as a bugfix.

Ah ok. From my point of view it is not bug fix but new features and should go to the u-boot
in proper merge window.
No problem to wait just wanted to get update on this to be able to better plan our work.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform


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