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From: Li Qiang <liq3ea@gmail.com>
To: chipsec@lists.01.org
Subject: How to read/write SPI flash descriptor
Date: Thu, 09 May 2019 15:31:11 +0800	[thread overview]
Message-ID: <CAKXe6SKOfuyB3jOvhMFzd617Wxj0R-yF=HSeUtoA5MWYA5-+YA@mail.gmail.com> (raw)

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Hello all,

I used chipsec to evaluate my hardware.

And I got following report:

[-] Software has write access to SPI flash descriptor
[-] FAILED: SPI flash permissions allow SW to write flash descriptor

I look at the chipsec source code and find that this is read from frap
register(SPIBAR + 50h).
However I can't find the spec how to read the SPI flash descriptor itself.
I find some code from flashrom:
https://github.com/flashrom/flashrom/blob/db7482bb72035fab8386226d1720cde09e0c700e/ich_descriptors.c

It reads SPI flash descriptor using MMIO, but also I don't know how to
write it.(it has no effect when write to the same register with read).

Any hints?

Thanks,
Li Qiang

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next             reply	other threads:[~2019-05-09  7:31 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-09  7:31 Li Qiang [this message]
2022-04-15 11:57 ` How to read/write SPI flash descriptor ericc6727
2022-04-15 11:57 ` ericc6727
2022-06-30 11:01 ` beausconce
2022-08-26  9:37 ` jacobsmithooopp122

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