Re: [flashrom] problem with SST25VF040B

[Carl-Daniel Hailfinger]

Hello Fabio,

Am 25.09.2013 15:01 schrieb Fabio:
> hello, I'm trying to retrieve a notebook with SST25VF040B, but is not
> recognized by flashrom. I'm using a asus motherboard with Intel P67,
> Winbond is that mounts originally riconoscituo while the SST25VF040B not.
> What could I check?
> thanks
>
> [...]
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2 0x52bf
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2 0x535f
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2 0x72bf
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2 0x72ff
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2 0x73ff
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2 0x7fff
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0xfa, id2 0xa6bf
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0xfa, id2 0xe57f
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0xfa, id2 0xffff
>  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0xfc, id2 0xafff
> [...]

A SST25VF040B should have id1 0xbf, id2 0x258d. The values above look
like some sort of corruption. All IDs returned by probe_spi_rdid_generic
should have been identical.
This corruption can be caused by:
1. Wrong voltage for the flash chip. flashrom can't change the default
voltage on Intel chipsets. The SST25VF040B expects 2.7V-3.6V.
2. Wrong speed for the flash chip. flashrom uses 20 MHz on Intel chipsets.
3. Unstable connection to the flash chip. Are the wires too long (longer
than 5 cm) or is there a soldering problem?

You could try to use another programmer (e.g. Intel network card) for
this flash chip. Maybe that works better.

Regards,
Carl-Daniel

problem with SST25VF040B

[Fabio]

the chip was directly connected (desoldered from notebook) with a cable
adapter of 3-5cm..
can you tell me an "Intel network card" valid to find?

thanks and congratulations for the work done!

2013/9/27 Carl-Daniel Hailfinger
> Hello Fabio,
>
> Am 25.09.2013 15:01 schrieb Fabio:
> > hello, I'm trying to retrieve a notebook with SST25VF040B, but is not
> > recognized by flashrom. I'm using a asus motherboard with Intel P67,
> > Winbond is that mounts originally riconoscituo while the SST25VF040B not.
> > What could I check?
> > thanks
> >
> > [...]
> >  RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2
>
> 0x52bf
> > RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2
>
> 0x535f
> > RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2
>
> 0x72bf
> > RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2
>
> 0x72ff
> > RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2
>
> 0x73ff
> > RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0x7d, id2
>
> 0x7fff
> > RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0xfa, id2
>
> 0xa6bf
> > RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0xfa, id2
>
> 0xe57f
> > RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0xfa, id2
>
> 0xffff
> > RDID byte 0 parity violation. probe_spi_rdid_generic: id1 0xfc, id2
>
> 0xafff
> > [...]
>
> A SST25VF040B should have id1 0xbf, id2 0x258d. The values above look
> like some sort of corruption. All IDs returned by probe_spi_rdid_generic
> should have been identical.
> This corruption can be caused by:
> Wrong voltage for the flash chip. flashrom can't change the default
>
> voltage on Intel chipsets. The SST25VF040B expects 2.7V-3.6V.
> 2. Wrong speed for the flash chip. flashrom uses 20 MHz on Intel chipsets.
> 3. Unstable connection to the flash chip. Are the wires too long (longer
> than 5 cm) or is there a soldering problem?
>
> You could try to use another programmer (e.g. Intel network card) for
> this flash chip. Maybe that works better.
>
> Regards,
> Carl-Daniel