question

[Magnus Johansson E]

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

Magnus Johansson

[Stefan Tauner]

On Tue, 4 Feb 2014 13:21:58 +0000
Magnus Johansson E  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... :)

[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:[e-mail]] 
Sent: den 4 februari 2014 23:33
To: Magnus Johansson E
Cc: [e-mail]
Subject: Re: [flashrom] question

On Tue, 4 Feb 2014 13:21:58 +0000
Magnus Johansson E  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... :)

[Carl-Daniel Hailfinger]

Hi Magnus,

in that case, please share your patch for the chip select signal (even
if it's just a patch to ichspi.c and has no user interface). We would
love to merge that.
If you have any other local changes which are missing in our tree,
please send them as well. Our goal is to have a flashrom tree which is
useful even for special cases.

Regards,
Carl-Daniel

Am 05.02.2014 08:56 schrieb 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.