[flashrom] Support for programming device on SPI via USB bridge?

[Robert Selby]

Many thanks :-)

-----Original Message-----
From: Stefan Tauner [mailto:stefan.tauner at alumni.tuwien.ac.at] 
Sent: 25 March 2015 22:14
To: Robert Selby
Cc: flashrom at flashrom.org
Subject: Re: [flashrom] Support for programming device on SPI via USB bridge?

On Wed, 25 Mar 2015 10:46:41 -0000
"Robert Selby" <Robert.Selby at snellgroup.com> wrote:

> Hi, just found FlashRom and looks to be a good base to start from for 
> my needs.
> 
> I have a USB->SPI bridge device (MCP2210) and on it's SPI bus is a 
> "S25FL128S" device.
> 
> It looks as though there is no direct support for accessing via the 
> MCP2210.
> 
> I assume that I would need to write a "programmer" to get this to work 
> ???
> 
> I have a MCP2210 access library that seems to work well via 
> "/dev/hidraw".
> 
> Any advice/recommendations very welcome.
> 
> It may be that someone has already done this ...

I don't know that device at all, but there are various programmer modules in flashrom that can give you hints how to add support for it.
"/dev/hidraw" sounds as if it is Linux-specific therefore I suggest you take a look at linux_spi.c and mstarddc_spi.c.

To get an idea of how to hook up the programmer and what else is necessary for a complete patch you can take a look at the patch that added the mstar ddc driver:
http://code.coreboot.org/p/flashrom/source/commit/1860/
or the preliminary (and probably broken) programmer driver creation
script: http://patchwork.coreboot.org/patch/3836/

--
Kind regards/Mit freundlichen Grüßen, Stefan Tauner

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