[coreboot] [PATCH] flashrom: Fix probe_spi_res failover

[FENG Yu Ning]

On Fri, Nov 28, 2008 at 1:32 AM, Carl-Daniel Hailfinger
<c-d.hailfinger.devel.2006 at gmx.net> wrote:
> The existing check in probe_spi_res() was right for SPI controllers
> which support all commands, but may not exist.
> For controllers which support only a subset of commands, it will fail in
> unexpected ways.

sometimes the controller supports that command, but the command is
1. not in the opmenu, and we cannot change it (spi conf locked down)
2. the slave spi flash chip does not support rdid.
for example, my ich7 + sst25lf040a (both 1. and 2.)

There is also BBAR issue in the probing process and more. spi_res only
reads from address 0x0, which could be below BBA. And there is
read-only opmenu index difference with our hardcoded opcodes table.
They are other problems to attack against seperately, though.

Obviousely ack from me is not decisive, but still
Acked-by: FENG yu ning <fengyuning1984 at gmail.com>