[PATCH 0/2] aspeed/smc: fix data corruption on witherspoon machines

[Cédric Le Goater]

Hello,

We have been seeing a squashfs corruption on the witherspoon-bmc
machine for quite some time. It boots but quickly after boot
corruption errors start to fill the console. This machine has two BMC
chips with UBIfs on them. The romulus-bmc machine has a similar
problem when both PNOR are enabled.

After some investigation, it appeared that the SPI transfers on the
two chips were getting mixed and after more investigation, the User
mode select/unselect scheme of the Aspeed SMC model proved to be
broken. It's been there since the right beginning of the model. Here
is a fix.

Kudos to Andrew J. for the time he spent on this and Andrew G. for his
patience.

I pushed the code on my github branch aspeed-5.0 for more testing.

Thanks,

C.

Cédric Le Goater (2):
  aspeed/smc: Add some tracing
  aspeed/smc: Fix User mode select/unselect scheme

 Makefile.objs       |  1 +
 hw/ssi/aspeed_smc.c | 56 ++++++++++++++++++++++++++++++++-------------
 hw/ssi/trace-events | 10 ++++++++
 3 files changed, 51 insertions(+), 16 deletions(-)
 create mode 100644 hw/ssi/trace-events

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2.21.1