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riscv/sifive_u: Add the start-in-flash property

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Add a property that when set to true QEMU will jump from the ROM code to
the start of flash memory instead of DRAM which is the default
behaviour.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Alistair Francis 2019-10-08 16:32:18 -07:00 committed by Palmer Dabbelt
parent 687caef13d
commit fc41ae230e
No known key found for this signature in database
GPG Key ID: EF4CA1502CCBAB41
2 changed files with 31 additions and 1 deletions
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30
hw/riscv/sifive_u.c
View File

@ -315,6 +315,7 @@ static void riscv_sifive_u_init(MachineState *machine)
MemoryRegion *system_memory = get_system_memory();
MemoryRegion *main_mem = g_new(MemoryRegion, 1);
MemoryRegion *flash0 = g_new(MemoryRegion, 1);
target_ulong start_addr = memmap[SIFIVE_U_DRAM].base;
int i;
/* Initialize SoC */
@ -357,6 +358,10 @@ static void riscv_sifive_u_init(MachineState *machine)
}
}
if (s->start_in_flash) {
start_addr = memmap[SIFIVE_U_FLASH0].base;
}
/* reset vector */
uint32_t reset_vec[8] = {
0x00000297, /* 1: auipc t0, %pcrel_hi(dtb) */
@ -369,7 +374,7 @@ static void riscv_sifive_u_init(MachineState *machine)
#endif
0x00028067, /* jr t0 */
0x00000000,
memmap[SIFIVE_U_DRAM].base, /* start: .dword DRAM_BASE */
start_addr, /* start: .dword */
0x00000000,
/* dtb: */
};
@ -433,8 +438,31 @@ static void riscv_sifive_u_soc_init(Object *obj)
TYPE_CADENCE_GEM);
}
static bool sifive_u_get_start_in_flash(Object *obj, Error **errp)
{
SiFiveUState *s = RISCV_U_MACHINE(obj);
return s->start_in_flash;
}
static void sifive_u_set_start_in_flash(Object *obj, bool value, Error **errp)
{
SiFiveUState *s = RISCV_U_MACHINE(obj);
s->start_in_flash = value;
}
static void riscv_sifive_u_machine_instance_init(Object *obj)
{
SiFiveUState *s = RISCV_U_MACHINE(obj);
s->start_in_flash = false;
object_property_add_bool(obj, "start-in-flash", sifive_u_get_start_in_flash,
sifive_u_set_start_in_flash, NULL);
object_property_set_description(obj, "start-in-flash",
"Set on to tell QEMU's ROM to jump to " \
"flash. Otherwise QEMU will jump to DRAM",
NULL);
}
static void riscv_sifive_u_soc_realize(DeviceState *dev, Error **errp)

2
include/hw/riscv/sifive_u.h
View File

@ -57,6 +57,8 @@ typedef struct SiFiveUState {
void *fdt;
int fdt_size;
bool start_in_flash;
} SiFiveUState;
enum {