[flashrom] [PATCH] Allow bus override with forced read

[stephen at hyarros.com]

Acked-by: Stephen Kou <stephen at hyarros.com>

Dump of "successful" forced read:

flashrom v0.9.2-r1075 on Linux 2.6.32-23-generic (x86_64), built with
libpci 3.0.0, GCC 4.4.3, little endian
flashrom is free software, get the source code at
http://www.flashrom.org

Calibrating delay loop... OK.
No coreboot table found.
Found chipset "Intel ICH10R", enabling flash write... tried to set 0xdc
to 0xb on ICH10R failed (WARNING ONLY)
WARNING: SPI Configuration Lockdown activated.
FAILED!
This chipset supports the following protocols: FWH,SPI.
No EEPROM/flash device found.
Force read (-f -r -c) requested, pretending the chip is there:
Assuming chip "AMD Am29F016D" (2048 KB, Parallel) at physical address
0xffe00000.
Please note that forced reads most likely contain garbage.
Reading flash... done.


On Wed, 14 Jul 2010 11:53:03 +0200, Carl-Daniel Hailfinger
<c-d.hailfinger.devel.2006 at gmx.net> wrote:
> If someone wants to perform a forced read of a chip via mmap, we should
> allow that even if the host doesn't support the bus this chip needs.
> Example:
> flashrom -p dummy:bus=spi -V -c Am29F016D -f -r foo.rom
> This won't work right now because -f won't override probe skipping. So
> far the only use of this bus override is for the internal programmer,
> and as such I wonder whether we should make the bus override conditional
> on the internal programmer. It's pointless for other programmers anyway.
> 
> Comments welcome.
> 
> Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>
> 
> Index: flashrom-force_chip_incompatible_bus/flashrom.c
> ===================================================================
> --- flashrom-force_chip_incompatible_bus/flashrom.c	(Revision 1079)
> +++ flashrom-force_chip_incompatible_bus/flashrom.c	(Arbeitskopie)
> @@ -1007,7 +1007,7 @@
>  			continue;
>  		}
>  		buses_common = buses_supported & flash->bustype;
> -		if (!buses_common) {
> +		if (!buses_common && !force) {
>  			tmp = flashbuses_to_text(buses_supported);
>  			msg_gdbg("skipped.");
>  			msg_gspew(" Host bus type %s ", tmp);