Flashing host SPI NOR
Aaron Williams
awilliams at marvell.com
Thu Jan 24 21:09:26 AEDT 2019
Hi all,
I've run into a problem when it comes to flashing our host SPI NOR. If I boot
our host then the SPI NOR is put in a different mode and I am unable to write
to it from OpenBMC. The only way I can update our host SPI NOR is if I first
power down the host then reboot OpenBMC. Is there some way I can force OpenBMC
to re-initialize the SPI NOR before writing to it? I can read from the SPI nor
just fine from the BMC after the host has accessed it, I just can't erase or
write to it without everything getting corrupted. The device is a Macronix
MX25L25645GMI-08G. Note that on the host side we are using QREAD and 4PP mode
and 4 bit mode whereas for OpenBMC we only have 1 bit mode wired up.
Ideally I'd love to be able to make use of the GPIO arbitration we have
between the host and the BMC. We have two GPIO pins, one where the host
requests access to the SPI NOR and the other where the BMC grants access.
-Aaron
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