[U-Boot] [PATCH] am335x: NAND: add BCH16 and 4k page size support

[Tom Rini <trini@ti.com>]

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On 01/29/2013 02:54 PM, Scott Wood wrote:
> On 01/28/2013 07:35:40 AM, Jordy van Wolferen wrote:
>> This is tested with a custom AM3359 (rev 2.0) board. NAND chip:
>> MT29F16G08ABABAWP
>> 
>> This code allows me to boot from ROM code. The ROM code forces
>> BCH16 on NAND chips with a 4k page size.
>> 
>> BCH16 is not enabled by default.
>> 
>> 
>> ---
> 
> Missing Signed-off-by (please read the "Sign your work" section of 
> Documentation/SubmittingPatches in Linux and be sure that you meet
> the conditions of the Developer's Certificate of Origin before
> adding your sign off).

Note that this also appears to be versus a TI SDK tree and not mainline
(but migrating the code shouldn't be overly difficult now that NAND
support is mainline).

> Could you explain the patch in a bit more detail?  You say it is
> "not enabled by default" -- what would be required to enable it?

It needs to be auto-detected and switched to, just like how the ROM
does (which is to say when the ROM picks up BCH16 and wants it, we do
too).

[snip]
>> diff --git a/include/linux/mtd/mtd-abi.h
>> b/include/linux/mtd/mtd-abi.h index 8bdd231..6979a2a 100644 ---
>> a/include/linux/mtd/mtd-abi.h +++ b/include/linux/mtd/mtd-abi.h 
>> @@ -125,7 +125,7 @@ struct nand_oobfree { */ struct
>> nand_ecclayout { uint32_t eccbytes; -    uint32_t eccpos[128]; +
>> uint32_t eccpos[208]; uint32_t oobavail; struct nand_oobfree
>> oobfree[MTD_MAX_OOBFREE_ENTRIES]; };
> 
> Changes to generic code should ideally be separate patches.

True.  And I wonder if the mtd re-sync covers this or not.

- -- 
Tom
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