[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[PATCH 3/3] hw/riscv: opentitan: Expose the resetvec as a SoC property

From: Alistair Francis
Subject: [PATCH 3/3] hw/riscv: opentitan: Expose the resetvec as a SoC property
Date: Wed, 14 Sep 2022 12:11:08 +0200

On the OpenTitan hardware the resetvec is fixed at the start of ROM. In
QEMU we don't run the ROM code and instead just jump to the next stage.
This means we need to be a little more flexible about what the resetvec

This patch allows us to set the resetvec from the command line with
something like this:
    -global driver=riscv.lowrisc.ibex.soc,property=resetvec,value=0x20000400

This way as the next stage changes we can update the resetvec.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
 include/hw/riscv/opentitan.h | 2 ++
 hw/riscv/opentitan.c         | 8 +++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/hw/riscv/opentitan.h b/include/hw/riscv/opentitan.h
index 26d960f288..6665cd5794 100644
--- a/include/hw/riscv/opentitan.h
+++ b/include/hw/riscv/opentitan.h
@@ -46,6 +46,8 @@ struct LowRISCIbexSoCState {
     IbexTimerState timer;
     IbexSPIHostState spi_host[OPENTITAN_NUM_SPI_HOSTS];
+    uint32_t resetvec;
     MemoryRegion flash_mem;
     MemoryRegion rom;
     MemoryRegion flash_alias;
diff --git a/hw/riscv/opentitan.c b/hw/riscv/opentitan.c
index 45c92c9bbc..be7ff1eea0 100644
--- a/hw/riscv/opentitan.c
+++ b/hw/riscv/opentitan.c
@@ -142,7 +142,7 @@ static void lowrisc_ibex_soc_realize(DeviceState *dev_soc, 
Error **errp)
     object_property_set_int(OBJECT(&s->cpus), "num-harts", ms->smp.cpus,
-    object_property_set_int(OBJECT(&s->cpus), "resetvec", 0x20000400,
+    object_property_set_int(OBJECT(&s->cpus), "resetvec", s->resetvec,
     sysbus_realize(SYS_BUS_DEVICE(&s->cpus), &error_fatal);
@@ -297,10 +297,16 @@ static void lowrisc_ibex_soc_realize(DeviceState 
*dev_soc, Error **errp)
         memmap[IBEX_DEV_PERI].base, memmap[IBEX_DEV_PERI].size);
+static Property lowrisc_ibex_soc_props[] = {
+    DEFINE_PROP_UINT32("resetvec", LowRISCIbexSoCState, resetvec, 0x20000400),
 static void lowrisc_ibex_soc_class_init(ObjectClass *oc, void *data)
     DeviceClass *dc = DEVICE_CLASS(oc);
+    device_class_set_props(dc, lowrisc_ibex_soc_props);
     dc->realize = lowrisc_ibex_soc_realize;
     /* Reason: Uses serial_hds in realize function, thus can't be used twice */
     dc->user_creatable = false;

reply via email to

[Prev in Thread] Current Thread [Next in Thread]