hw/arm/aspeed_ast27x0-fc: Map FMC0 flash contents into CA35 boot ROM

This patch introduces a dedicated ca35_boot_rom memory region and
copies the FMC0 flash data into it.

The motivation is to support the upcoming vbootrom. The vbootrom
replaces the existing BOOTMCU (RISC-V 32 SPL) flow, which currently reads
the "image-bmc" from FMC_CS0 and loads the following components
into DRAM:

- Trusted Firmware-A
- OP-TEE OS
- u-boot-nodtb.bin
- u-boot.dtb

After loading, BOOTMCU releases the CA35 reset so that CA35 can start
executing Trusted Firmware-A.

The vbootrom follows the same sequence: CA35 fetches "image-bmc" from FMC0
flash at the SPI boot ROM base address (0x100000000), parses the FIT image,
loads each component into its designated DRAM location, and then jumps to
Trusted Firmware-A.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20251015062210.3128710-8-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/arm/aspeed_ast27x0-fc.c b/hw/arm/aspeed_ast27x0-fc.c
index 99af87dbd7bd5bda4e3398a73f3fa93a7a45306c..99c0b3415990f8a6fbeaac15bdf3568a0cff91a8 100644 (file)
--- a/hw/arm/aspeed_ast27x0-fc.c
+++ b/hw/arm/aspeed_ast27x0-fc.c
@@ -35,6 +35,7 @@ struct Ast2700FCState {
 
     MemoryRegion ca35_memory;
     MemoryRegion ca35_dram;
+    MemoryRegion ca35_boot_rom;
     MemoryRegion ssp_memory;
     MemoryRegion tsp_memory;
 
@@ -44,8 +45,6 @@ struct Ast2700FCState {
     Aspeed27x0SoCState ca35;
     Aspeed27x0CoprocessorState ssp;
     Aspeed27x0CoprocessorState tsp;
-
-    bool mmio_exec;
 };
 
 #define AST2700FC_BMC_RAM_SIZE (1 * GiB)
@@ -61,6 +60,9 @@ static bool ast2700fc_ca35_init(MachineState *machine, Error **errp)
     Ast2700FCState *s = AST2700A1FC(machine);
     AspeedSoCState *soc;
     AspeedSoCClass *sc;
+    BlockBackend *fmc0 = NULL;
+    DeviceState *dev = NULL;
+    uint64_t rom_size;
 
     object_initialize_child(OBJECT(s), "ca35", &s->ca35, "ast2700-a1");
     soc = ASPEED_SOC(&s->ca35);
@@ -112,6 +114,14 @@ static bool ast2700fc_ca35_init(MachineState *machine, Error **errp)
     ast2700fc_board_info.ram_size = machine->ram_size;
     ast2700fc_board_info.loader_start = sc->memmap[ASPEED_DEV_SDRAM];
 
+    dev = ssi_get_cs(soc->fmc.spi, 0);
+    fmc0 = dev ? m25p80_get_blk(dev) : NULL;
+
+    if (fmc0) {
+        rom_size = memory_region_size(&soc->spi_boot);
+        aspeed_install_boot_rom(soc, fmc0, &s->ca35_boot_rom, rom_size);
+    }
+
     arm_load_kernel(ARM_CPU(first_cpu), machine, &ast2700fc_board_info);
 
     return true;