linux-kernel - Re: [DEBUG] mtd: spi-nor: dump DWORDs of the Basic Flash Parameter Table

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Date:   Mon, 11 Sep 2017 10:58:36 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Cc:     Marek Vasut <marek.vasut@...il.com>,
        MTD Maling List <linux-mtd@...ts.infradead.org>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Boris BREZILLON <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [DEBUG] mtd: spi-nor: dump DWORDs of the Basic Flash Parameter Table

Hi Cyrille,

On Thu, Sep 7, 2017 at 9:28 PM, Cyrille Pitchen
<cyrille.pitchen@...ev4u.fr> wrote:
>> Can you apply this patch on your tree then report me what was printed, please?
>> I have an idea of the root cause of your issue then a potential work-around
>> but I first need to validate my assumption to confirm that the work-around
>> would actually work.

+m25p80 spi0.0: DWORD1 = 0xffffffff
+m25p80 spi0.0: DWORD2 = 0xffffffff
+m25p80 spi0.0: DWORD3 = 0xffffffff
+m25p80 spi0.0: DWORD4 = 0xffffffff
+m25p80 spi0.0: DWORD5 = 0xffffffff
+m25p80 spi0.0: DWORD6 = 0xffffffff
+m25p80 spi0.0: DWORD7 = 0xffffffff
+m25p80 spi0.0: DWORD8 = 0xffffffff
+m25p80 spi0.0: DWORD9 = 0xffffffff
+m25p80 spi0.0: DWORD10 = 0x00000000
+m25p80 spi0.0: DWORD11 = 0x00000000
+m25p80 spi0.0: DWORD12 = 0x00000000
+m25p80 spi0.0: DWORD13 = 0x00000000
+m25p80 spi0.0: DWORD14 = 0x00000000
+m25p80 spi0.0: DWORD15 = 0x00000000
+m25p80 spi0.0: DWORD16 = 0x00000000
+m25p80 spi0.0: BFPT version 1.0 (length = 9)

> If you could also dump the value of the 'addr' argument of
> spi_nor_read_sfdp_dma_unsafe() just before the for () loop below in the
> very same function. Actually, I suspect the SFDP tables of your SPI NOR

+m25p80 spi0.0: addr = 0x448

> memory sample to have been programmed with invalid values, neither
> compliant with the JEDEC JESD216 specification nor with the Cypress
> datasheet for this memory part.

Sounds plausible.
I get the same values when disabling DMA, so it's not due to bad DMA handling.
All Renesas boards I have local or remote access to have spansion,s25fl512s.

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds