[PATCH qemu 06/12] ast2400: use contents of first SPI flash as a rom

[Cédric Le Goater]

This provides support for U-Boot images which are loaded at 0x0.

A Palmetto BMC guest can now be simply booted with :

  $ qemu-system-arm -m 256 -M palmetto-bmc -nographic -nodefaults  \
	-mtdblock ./flash-palmetto-20160512040959  \
	-mtdblock ./palmetto.pnor

The first block device uses the file "./flash-palmetto-20160512040959"
which will act as a SPI flash module for the BMC, handled by the
SMC/FMC controller. The second block device uses the file
"./palmetto.pnor" which is an OpenPower firmware image for a palmetto
OpenPower system. This one will be handled by the SMC/SPI controller.

The flash images can be grabbed here :

    https://openpower.xyz/job/openbmc-build/distro=ubuntu,target=palmetto/lastSuccessfulBuild/artifact/images/palmetto/flash-palmetto
    https://openpower.xyz/job/openpower-op-build/distro=ubuntu,target=palmetto/lastSuccessfulBuild/artifact/images/palmetto.pnor

We could add a second BMC SPI flash by changing the 'num-cs' property
of the controller and emulate a golden image flash module.

Signed-off-by: Cédric Le Goater <clg at kaod.org>
---

 That might seem a little too hacky ? 

 hw/arm/palmetto-bmc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/arm/palmetto-bmc.c b/hw/arm/palmetto-bmc.c
index c4099987d354..50369c0331a6 100644
--- a/hw/arm/palmetto-bmc.c
+++ b/hw/arm/palmetto-bmc.c
@@ -17,6 +17,7 @@
 #include "hw/arm/arm.h"
 #include "hw/arm/ast2400.h"
 #include "hw/boards.h"
+#include "hw/loader.h"
 
 static struct arm_boot_info palmetto_bmc_binfo = {
     .loader_start = AST2400_SDRAM_BASE,
@@ -53,6 +54,14 @@ static void palmetto_bmc_init(MachineState *machine)
     aspeed_smc_init_flashes(&bmc->soc.smc, "n25q256a");
     aspeed_smc_init_flashes(&bmc->soc.spi, "mx25l25635e");
 
+    /*
+     * Install first SMC/FMC flash content as a rom.
+     */
+    if (bmc->soc.smc.flashes[0]) {
+        rom_add_blob_fixed("aspeed.smc.0", bmc->soc.smc.flashes[0]->storage,
+                           bmc->soc.smc.flashes[0]->size, 0);
+    }
+
     palmetto_bmc_binfo.kernel_filename = machine->kernel_filename;
     palmetto_bmc_binfo.initrd_filename = machine->initrd_filename;
     palmetto_bmc_binfo.kernel_cmdline = machine->kernel_cmdline;
-- 
2.1.4