[flashrom] Unable to flash bios on a Tyan S2915-E

Carl-Daniel Hailfinger c-d.hailfinger.devel.2006 at gmx.net
Thu Dec 3 16:41:24 CET 2009

Hi Joel,

IIRC you were the one who sent us a huge list of Tyan systems supported
by flashrom last year. That's why you're now the one whom we're asking
for a flashrom problem on the Tyan S2915.

The flash chip on a Tyan S2915 is not detected flashrom. Somehow the
flash chip does not respond to detection cycles. Are you aware of any
special hardware on that board which might sit between the southbridge
and the flash chip or any dual-chip tricks?

On 03.12.2009 14:18, Alessandro Polverini wrote:
> flashrom v0.9.1-r791
> No coreboot table found.
> Found chipset "NVIDIA MCP55", enabling flash write... OK.

The chipset is recognized, and LPC write passthrough is activated.

> This chipset supports the following protocols: Non-SPI.
> Calibrating delay loop... OK.
> No EEPROM/flash device found.
> this is what's written on the chip:
> 49LF080A
> 33-4C-NHE
> 0726291-B

That chip is supported.

> I discovered the board is a S2915 and not S2915-E, the only difference
> is that in the latter quad and six core cpus are supported, but I
> suppose that's not relevant for you.

True. Given that chip and chipset are supported and the chip doesn't
need a write enable function to respond to the ID command, I can only
assume that something between the CPU and the flash chip drops write
cycles to the flash chip. This is very odd, to say the least. Another
alternative explanation would be multiple flash chips on that board.


P.S. Joel, if you have test results for more Tyan boards, please send
them in. Current flashrom has a lot better error detection and other
nice features. It can even flash network cards, SATA controllers, and
some graphics cards, plus it supports external programmers for assisted

Developer quote of the month: 
"We are juggling too many chainsaws and flaming arrows and tigers."

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