Re: [flashrom] flashrom Digest, Vol 80, Issue 8

[Márton Miklós]

Hello,

I wanted to contact with you earlier about the buspirate write failure, 
just I have forgotten it

I have also had problems with different external programmers and a the 
solution was adding a 100nF capacitor right next to the SPI flash.
That sorted out the intermittent failures.

HTH

Regards,
Miklos Marton

2016-01-05 12:54 keltezéssel, [e-mail] írta:
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> Today's Topics:
> 1. READ ERASE WRITE tested for W25X64 on buspirate_spi,	ICH9M-E
>    (Johannes Krampf)
>
>
> Message: 1
> Date: Tue, 5 Jan 2016 12:43:31 +0100
> From: Johannes Krampf 
> To: [e-mail]
> Subject: [flashrom] READ ERASE WRITE tested for W25X64 on
>    buspirate_spi,	ICH9M-E
> Message-ID: 
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Hello,
>
> I have successfully tested the Winbond W25X64 flash chip (8192 kB, SPI)
> for Probe, Read, Erase and Write operations using the buspirate_spi and
> Intel ICH9M-E (Thinkpad T400) programmers.
>
> Testing was done with flashrom v0.9.8-r1901 on ICH9M-E and v0.9.8-r1888
> (Parabola/Arch default) on buspirate_spi.
>
> I slightly modified board_enable.c in flashrom to add the T400 to the
> whitelist when flashing on r1901 (taken from libreboot patch):
> {0x8086, 0x2917, 0x17AA, 0x20F5,  0x8086, 0x2930, 0x17AA, 0x20F9,
>
> "^ThinkPad T400", NULL, NULL,      P2, "IBM/Lenovo",  "ThinkPad T400",
>          0,   OK, p2_whitelist_laptop},
>
> My buspirate is the sparkfun version and I used the 30cm long cable
> which connects directly to 0.1" headers and the recommended 6.2 FW
> version. Flashing worked at default (8M) speed with multiple reads
> always producing the same checksum.[1] Reading the ROM took around 13min.
>
> Logs are attached.
>
> Please don't hesitate to ask for more information if required.
> Johannes
>
> [1] This was not the case when flashing a Lenovo X200 with a Macronix
> MX25L6405D chip, where reading was *never* reliable, even though
> flashing worked. This was at spispeed=30K, with ~8cm cables and both
> external and internal power. The chip would not be detected at higher
> speeds. No such issues at all with the W25X64.

flashrom Digest, Vol 80, Issue 8

[Stefan Tauner]

On Tue, 5 Jan 2016 13:07:49 +0100
Márton Miklós  wrote:
> Hello,
>
> I wanted to contact with you earlier about the buspirate write failure, 
> just I have forgotten it
>
> I have also had problems with different external programmers and a the 
> solution was adding a 100nF capacitor right next to the SPI flash.
> That sorted out the intermittent failures.

Hi,

right, that's a good thing to do anyway. I have added it as possible
solution for connection problems to
https://www.flashrom.org/Common_problems