[flashrom] question

[Magnus Johansson E]

Actually it is possible to toggle the chipselect by playing with the FADDR register, I will add an option into our flashrom where you can specify the chip-select signal. Then I have to use the sw_seq to be able to erase.

Thx anyway

-----Original Message-----
From: Stefan Tauner [mailto:stefan.tauner at student.tuwien.ac.at] 
Sent: den 4 februari 2014 23:33
To: Magnus Johansson E
Cc: flashrom at flashrom.org
Subject: Re: [flashrom] question

On Tue, 4 Feb 2014 13:21:58 +0000
Magnus Johansson E <magnus.e.johansson at ericsson.com> wrote:

> Im working with a HW unit (similar to the ICH10), that has two SPI devices connected.
> 
> enum ich_spi_mode {
>                                 ich_auto,
>                                 ich_hwseq,
>                                 ich_swseq
>                 } ich_spi_mode = ich_auto;
> 
> And I cannot use the ich_hwseq (which is propsed) because the Intel Chipset is only capable of erasing:
> 00: 256 byte
> 01: 4 KB
> 10: 8 KB
> 11: 64 KB
> 
> And my flash chip, only support Sector erase/ or Bulk (but I don't like that one) and each sector is 256kB.
> 
> So how can I proceed here? As I understand I cannot use the hw_seq and have to go for the sw_seq. But then how to handle the chip-select? When Im running the sw_seq I can only use one flash device, ..
> 
> Thanks for support

To my knowledge it is not possible to toggle the chip select by usual means. The hardware SPI controller does it itself and only if you are using hardware sequencing. Also, a flash chip without 4kB erase opcodes does not comply with Intel's requirement for flash chips (and in this particular case I think these are hard requirements and not just recommendations as usual).

So, these are questions you should ask Intel; or whoever mated these flash chips with the board, if at all... :)

--
Kind regards/Mit freundlichen Grüßen, Stefan Tauner