[flashrom] FYI: flashrom output for Altera EPCQ16

[Stefan Tauner]

On Thu, 30 Jun 2016 00:53:28 +0000
"Ma, Peter" <peter.ma at intel.com> wrote:

> https://www.altera.com/content/dam/altera-www/global/en_US/pdfs/literature/hb/cfg/cfg_cf52012.pdf
> 
> […]
> 
> Probing for AMIC A25L05PT, 64 kB: probe_spi_rdid_generic: id1 0x20, id2 0xba15

Hello Peter,

thanks for your report. The replies this chip sends makes me think that
Altera acquired the IP from Micron because the ID is exactly what you
would expect from an N25Q016??3E chip, that is a 3.3 V, 16 Mb flash
chip. However, as far as I can tell there never was a public datasheet
available for such a chip, only its 1.8 V variants (which are supported
by flashrom). The IP theory also makes completely sense due to the
bonds (no pun intended) between Intel and Micron as well as Intel and
Altera ;)

The Altera datasheet disguises this by specifying the replies to the
RDID identification opcode (Read Device Identification Operation)
incompletely: they do not define the first and second byte of the
reply. The first byte identifies the flash as ST (now Micron): 0x20.

I'll need to dig further to see if there are any clear distinctions
between the "Altera" chips and the existing bigger 3.3 V ST models that
are also specified in the Altera datasheet but for which I have
original Micron datasheets to cross check. If nothing dramatically
comes up I'll add the needed chip definition to flashrom. Have you
tried what flashrom promises, i.e. that flashrom should fully work with
the generic definitions replied by the chip (SFDP)?

-- 
Kind regards/Mit freundlichen Grüßen, Stefan Tauner