[EXT] Re: Boot failed after patch "mtd: rawnand: Support for sequential cache reads"

[Bean Huo]

Hi Miquel

I only can say, we have not experienced this kind issue yet.  My suggestion as yours, please firstly
Let Alex add debug print in mtd, especially in NAND driver. To check what exactly error causes this
SquashFS complain, is it IO error,  or CRC,  or ECC error, or NAND device no response and timeout?

Kind regards,
Bean

> -----Original Message-----
> From: Miquel Raynal <miquel.raynal at bootlin.com>
> Sent: Monday, June 5, 2023 10:40 AM
> To: Alexander Shiyan <eagle.alexander923 at gmail.com>
> Cc: Bean Huo <beanhuo at micron.com>; JaimeLiao <jaimeliao.tw at gmail.com>;
> linux-mtd at lists.infradead.org
> Subject: Re: [EXT] Re: Boot failed after patch "mtd: rawnand: Support for sequential
> cache reads"
> 
> CAUTION: EXTERNAL EMAIL. Do not click links or open attachments unless you
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> 
> 
> Hi Alexander,
> 
> eagle.alexander923 at gmail.com wrote on Fri, 2 Jun 2023 12:52:08 +0300:
> 
> > Hello.
> >
> > > As you mentioned no ECC error.  And SquashFS complains: Unable to read data
> cache.
> > > We want to see I/Ox, RE#, WE# and R/B#, to check if command input and data
> output properly.
> > > It is better to capture the command 31h, and its following data.
> >
> > I only have a two-channel oscilloscope :) In any case, in order to
> > capture the right moment, I need to somehow loop command 0x31 when an
> > error occurs in order to take a picture. Right?
> >
> > Please, tell me where I can patch the nand_base to get such an
> > infinity loop on error?
> 
> Anywhere in the core you could just make your own exec_op sequence and call it in
> a loop I guess?
> 
> Bean, what are you trying to picture precisely? Have you ever had any issues with
> these commands? Can Alexander try to add a surgical delay somewhere?
> 
> Thanks,
> Miquèl