[Skiboot] [PATCH 3/4] libflash: blocklevel backend for MBOX flash access

[Stewart Smith]

Michael Neuling <mikey at neuling.org> writes:
> From: Cyril Bur <cyril.bur at au1.ibm.com>
>
> The use MBOX protocol to request flash access from the BMC.  Then
> read/write to the 'flash' through windows it creates on LPC FW space.
>
> Reference implementation of the mbox flash daemon for BMC userspace:
>   https://github.com/cyrilbur-ibm/mboxbridge
>
> Signed-off-by: Cyril Bur <cyril.bur at au1.ibm.com>
> Signed-off-by: Michael Neuling <mikey at neuling.org>
> ---
>  libflash/Makefile.inc |   2 +-
>  libflash/mbox-flash.c | 576 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  libflash/mbox-flash.h |  24 +++
>  3 files changed, 601 insertions(+), 1 deletion(-)
>  create mode 100644 libflash/mbox-flash.c
>  create mode 100644 libflash/mbox-flash.h

Breaks booting POWER8 systems, e.g. Habanero with:

[   12.101042815,3] MBOX-FLASH: BMC NOT RESPONDING 12 second wait
...
[   31.001198232,3] MBOX-FLASH: BMC NOT RESPONDING 31 second wait
[   31.103688026,3] MBOX-FLASH: Timeout waiting for BMC
[   31.103755305,3] MBOX-FLASH: Error waiting for BMC
[   31.103828069,3] PLAT: Failed to open init PNOR driver

-- 
Stewart Smith
OPAL Architect, IBM.