Re: [PATCH v4 0/5] mtd: pxa3xx_nand: rework the timing setup

From: Ezequiel Garcia
Date: Mon Nov 02 2015 - 10:49:53 EST

On 22 October 2015 at 12:12, Thomas Petazzoni
<thomas.petazzoni@xxxxxxxxxxxxxxxxxx> wrote:
> Hello Antoine,
> On Wed, 21 Oct 2015 10:28:59 +0200, Antoine Tenart wrote:
>> Antoine Tenart (5):
>> mtd: pxa3xx: prepare allowing compile test
>> mtd: nand: allow compile test of MTD_NAND_PXA3xx
>> mtd: pxa3xx_nand: add helpers to setup the timings
>> mtd: pxa3xx_nand: rework flash detection and timing setup
>> mtd: pxa3xx_nand: clean up the pxa3xx timings
> I tested your series on Armada 375 DB, which uses the same pxa3xx
> driver, but with the Armada 370 variant.
> With the current Device Tree which has nand,keep-config to keep the
> timing configuration from the bootloader, I don't see any problem, so
> there is no regression introduced by your series, at least on this
> platform.
> However, when I remove nand,keep-config to use the ONFI timings from
> the NAND, then things work fine (I can mount a UBIFS root filesystem),
> but there is a weird:
> pxa3xx-nand f10d0000.nand: Wait time out!!!
> After investigating a bit, the following steps occur:
> * The timings are configured as ONFI mode 0
> * Reset command is sent to the NAND (0xff), two times in a row.
> * READID command is sent to the NAND (0x90), three times in a row.
> * PARAM command is sent to the NAND (0xec) and it times out

This timeout happens because initial chunk_size is 512, but the PARAM
page read is now set to read 2048 (only on the NFCv2 controller variant).

I'll prepare a patchset soon.
Ezequiel GarcÃa, VanguardiaSur
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