[Qemu-arm] [PATCH 6/7] 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 <address@hidden>
---
 hw/arm/palmetto-bmc.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/hw/arm/palmetto-bmc.c b/hw/arm/palmetto-bmc.c
index b00757dcbc69..fcbb4f197162 100644
--- a/hw/arm/palmetto-bmc.c
+++ b/hw/arm/palmetto-bmc.c
@@ -33,6 +33,8 @@ typedef struct PalmettoBMCState {
     MemoryRegion ram;
 } PalmettoBMCState;
 
+static bool palmetto_bmc_has_flash0;
+
 static void palmetto_bmc_init_flashes(AspeedSMCState *s, const char *flashtype,
                                       Error **errp)
 {
@@ -51,6 +53,7 @@ static void palmetto_bmc_init_flashes(AspeedSMCState *s, 
const char *flashtype,
         if (dinfo) {
             qdev_prop_set_drive(fl->flash, "drive", blk_by_legacy_dinfo(dinfo),
                                 errp);
+            palmetto_bmc_has_flash0 = true;
         }
         m25p80_set_rom_storage(fl->flash, &fl->mmio);
         qdev_init_nofail(fl->flash);
@@ -82,6 +85,21 @@ static void palmetto_bmc_init(MachineState *machine)
     palmetto_bmc_init_flashes(&bmc->soc.smc, "n25q256a", &error_abort);
     palmetto_bmc_init_flashes(&bmc->soc.spi, "mx25l25635f", &error_abort);
 
+    /*
+     * Install first SMC/FMC flash content as a rom.
+     */
+    if (palmetto_bmc_has_flash0) {
+        AspeedSMCFlash *flash0 = &bmc->soc.smc.flashes[0];
+        MemoryRegion *flash0alias = g_new(MemoryRegion, 1);
+
+        memory_region_init_alias(flash0alias, OBJECT(&bmc->soc.smc),
+                                 "flash0alias", &flash0->mmio, 0,
+                                 flash0->size);
+
+        memory_region_add_subregion(get_system_memory(), 0, flash0alias);
+        palmetto_bmc_binfo.firmware_loaded = true;
+    }
+
     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