Re: [flashrom] flashrom Digest, Vol 83, Issue 4

[Max]

Antonio, seems you have purchased typical Chineese VT6421 card with fake
ROM.
VT6421 supports only LPC chips. Nowadays China manufacturers simply
utilizes old parallel flash chips by this manner. Look thoroughly, this IC,
most likely, even not connected to flash chip interface pins of VT6421
(sometimes it even soldered only on corner pins).

Look with Google translate on this thread:
http://forum.ixbt.com/topic.cgi?id=11:38403, with this key post:
http://forum.ixbt.com/topic.cgi?id=11:38403:488#488.
There's enthusiast who developed flash tool and heavily modified RAID BIOS
and explored Chinese flash chip phenomenon. There are also described flash
addressing issues. It's possible to desolder fake chip, add required few
component and set real working BIOS chip.
Actually, I done all that, soldered IC socket for BIOs chip and nowadays
searching for supported LPC flash chip.

===================================
Message: 2
Date: Tue, 5 Apr 2016 14:01:43 +0200
From: "Antonio Estrada Respeto" 
To: 
Subject: Re: [flashrom] VT6421 sata card with sst39Vf512 eprom
Message-ID: 
Content-Type: text/plain; format=flowed; charset="UTF-8";
        reply-type=original

Thank you for your support.

I have tried to take the output file as you request, but no luck. I always
start freedos in my usb sdcard boot choosing the number 3 option, then input
cswdpr0, and then execute flashrom comand. But if I try to make -o
logfilename.txt, the system refuses to save the file (it says that the file
does not exists). If I do not execute cswdpr0 at first time, always have a
disk write error. I suppose it will be related to the file log error.

Best regards,
Max Arephin.

2016-04-05 20:05 GMT+03:00 :
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> Today's Topics:
> Re: [PATCH] 4 byte address mode for Macronix MX25L25735F
> (Peter Martini)
> Re: VT6421 sata card with sst39Vf512 eprom
> (Antonio Estrada Respeto)
> Re: MX25L6445E erase and write failed! (The Raven)
> Adding support for MX25L6455EMI (The Raven)
> Adding some functionality to the FTDI driver
> (Salvador Eduardo Tropea)
>
> Message: 1
> Date: Tue, 5 Apr 2016 05:06:56 -0400
> From: Peter Martini 
> To: Tim Chick 
> Cc: David Hendricks , "[e-mail]"
>         
> Subject: Re: [flashrom] [PATCH] 4 byte address mode for Macronix
>         MX25L25735F
> Message-ID:
>         <
> [e-mail]>
> Content-Type: text/plain; charset="utf-8"
>
> Hi all,
>
> I'd asked about support for the MX25L25635E earlier on this list [
> https://www.flashrom.org/pipermail/flashrom/2015-September/013855.html],
> and have confirmed with the patches referenced there that I can read and
> flash my chip.  I'll try this patch tonight when I get home and report
> back; I'd love to see this support main-lined.
>
> Peter
>
> On Tue, Apr 5, 2016 at 3:18 AM, Tim Chick  wrote:
> > Hi David,
> >
> > There was a mistake in the logic, which I have corrected.
> >
> > I was also asked by someone else on the list if it worked with the
> > MX25L25635F, which is 32Mbytes, but uses 3-byte addressing by default.
> >
> > So I made the attached changes, which switch the chip to 4-byte mode. It
> > also has some dedicated 4-byte commands, and a BAR register, but it
>
> seemed
> > easiest to just use what I had tested for the MX25L25735F. I can?t
>
> actually
> > test the MX25L25635F though, as I don?t have one.
> >
> > Thanks,
> > Tim
> >
> > *From:* David Hendricks [mailto:[e-mail]]
> > *Sent:* 04 April 2016 23:21
> > *To:* Tim Chick
> > *Cc:* [e-mail]
> > *Subject:* Re: [flashrom] [PATCH] 4 byte address mode for Macronix
> > MX25L25735F
> >
> > On Thu, Mar 31, 2016 at 8:21 AM, Tim Chick
>
> wrote:
> > Hi List,
> >
> > Flashrom would not detect this chip. When the definition was added,
> > everything failed as the chip only supports 4 byte address operation.
> >
> > Interesting - I didn't know such chips existed. The ones I've used have
> > backwards-compatible commands that support 3-byte addresses. FYI - Some
> > other high-capacity chips have 4-byte address enable bit in a config
> > register that will make the usual read/write/erase instructions accept 4
> > byte addresses. And yet other large chips have alternative instructions
> > that function the same but only accept a 4-byte address.
> >
> > The attached patch adds 4 byte address support for 4 byte only chips, as
> > determined by the JEDEC flash parameter table, and support for this chip
> > specifically.
> >
> > I?ve only allowed it to work with the SPI_CONTROLLER_FT2232 controller,
>
> as
> > that is the only one I have to test.
> >
> > I?ve also only ported spi_block_erase_20 ? the other block erase
>
> functions
> > will fail.
> >
> > Please let me know what you think!
> >
> > Good stuff! FWIW, I have a work-in-progress patch on chromium.org (
> > https://chromium-review.googlesource.com/#/c/323359/) for the other
>
> types
> > of high-capacity flash chips. I've tested on a Spansion S25FS256 using
> > linux_spi and ft2232. It needs a lot of clean-up, but might be of help.
> > Most of the changes were to convert read/write/erase functions to use
> > allocated buffers whose length depends on whether we're using a 3- or
> > 4-byte address.
> >
> > I'll borrow some ideas from your patch as well to support the "4-byte
> > address only" chips.
> >
> > David Hendricks (dhendrix)
> > Systems Software Engineer, Google Inc.
> >
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