Hi Edgar,
From: Boddu, Sai Pavan
Sent: Friday, June 14, 2024 8:37 PM
To: Edgar E. Iglesias <edgar.igles...@gmail.com>
Cc: qemu-...@nongnu.org; qemu-devel@nongnu.org; Alistair Francis
<alist...@alistair23.me>; Peter Maydell <peter.mayd...@linaro.org>; Iglesias,
Francisco <francisco.igles...@amd.com>
Subject: RE: [PATCH 2/2] hw/arm/xilinx_zynq: Add boot-mode property
Hi Edgar,
I examined -boot switch to configure boot mode.
It would become little complex to map zynq boot devices to below expected
mapping.
* a-b: floppy disk drives
* c-f: IDE disk drives
* g-m: machine implementation dependent drives
* n-p: network devices
With above options, we may need to use “g-m” flags for our boot modes, which
becomes a little confusing.
So in order to make it user friendly, I would convert the proposed boot-mode
property to accept strings like “jtag/qspi/sd”.
Regards,
Sai Pavan
From: Edgar E. Iglesias
<edgar.igles...@gmail.com<mailto:edgar.igles...@gmail.com>>
Sent: Friday, June 14, 2024 4:38 PM
To: Boddu, Sai Pavan <sai.pavan.bo...@amd.com<mailto:sai.pavan.bo...@amd.com>>
Cc: qemu-...@nongnu.org<mailto:qemu-...@nongnu.org>;
qemu-devel@nongnu.org<mailto:qemu-devel@nongnu.org>; Alistair Francis
<alist...@alistair23.me<mailto:alist...@alistair23.me>>; Peter Maydell
<peter.mayd...@linaro.org<mailto:peter.mayd...@linaro.org>>; Iglesias,
Francisco <francisco.igles...@amd.com<mailto:francisco.igles...@amd.com>>
Subject: Re: [PATCH 2/2] hw/arm/xilinx_zynq: Add boot-mode property
On Thu, Jun 13, 2024 at 5:36 PM Sai Pavan Boddu
<sai.pavan.bo...@amd.com<mailto:sai.pavan.bo...@amd.com>> wrote:
Read boot-mode value as machine property and propagate that to
SLCR.BOOT_MODE register.
Hi Sai,
Directly exposing the register field to the user to set on the command-line
probably makes usability a little too rough (user has to check the register
specs in the TRM to change boot-mode).
We could perhaps add friendly names that we internally map to the register
field values.
Another question, can we use the existing -boot command-line arg for this?
Something along the lines of what x86 PC does:
https://github.com/qemu/qemu/blob/master/hw/i386/pc.c#L395
I don't know if the framework allows for long names but something like the
following would be nice:
qemu -boot spi,ethernet,jtag,uart,etc
[Boddu, Sai Pavan] Ok it makes much sense, Otherwise I would add more details
in the description of the new property about the possible boot modes.
Would also be great to document a small example, perhaps in
https://github.com/qemu/qemu/tree/master/docs/system/arm
[Boddu, Sai Pavan] Sure.
Regards,
Sai Pavan
Best regards,
Edgar
Signed-off-by: Sai Pavan Boddu
<sai.pavan.bo...@amd.com<mailto:sai.pavan.bo...@amd.com>>
---
hw/arm/xilinx_zynq.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/hw/arm/xilinx_zynq.c b/hw/arm/xilinx_zynq.c
index 7f7a3d23fb..4dfa9184ac 100644
--- a/hw/arm/xilinx_zynq.c
+++ b/hw/arm/xilinx_zynq.c
@@ -38,6 +38,7 @@
#include "qom/object.h"
#include "exec/tswap.h"
#include "target/arm/cpu-qom.h"
+#include "qapi/visitor.h"
#define TYPE_ZYNQ_MACHINE MACHINE_TYPE_NAME("xilinx-zynq-a9")
OBJECT_DECLARE_SIMPLE_TYPE(ZynqMachineState, ZYNQ_MACHINE)
@@ -90,6 +91,7 @@ struct ZynqMachineState {
MachineState parent;
Clock *ps_clk;
ARMCPU *cpu[ZYNQ_MAX_CPUS];
+ uint8_t BootMode;
};
static void zynq_write_board_setup(ARMCPU *cpu,
@@ -176,6 +178,19 @@ static inline int zynq_init_spi_flashes(uint32_t
base_addr, qemu_irq irq,
return unit;
}
+static void zynq_set_boot_mode(Object *obj, Visitor *v,
+ const char *name, void *opaque,
+ Error **errp)
+{
+ ZynqMachineState *m = ZYNQ_MACHINE(obj);
+ uint8_t val;
+
+ if (!visit_type_uint8(v, name, &val, errp)) {
+ return;
+ }
+ m->BootMode = val;
+}
+
static void zynq_init(MachineState *machine)
{
ZynqMachineState *zynq_machine = ZYNQ_MACHINE(machine);
@@ -241,6 +256,7 @@ static void zynq_init(MachineState *machine)
/* Create slcr, keep a pointer to connect clocks */
slcr = qdev_new("xilinx-zynq_slcr");
qdev_connect_clock_in(slcr, "ps_clk", zynq_machine->ps_clk);
+ qdev_prop_set_uint8(slcr, "boot-mode", zynq_machine->BootMode);
sysbus_realize_and_unref(SYS_BUS_DEVICE(slcr), &error_fatal);
sysbus_mmio_map(SYS_BUS_DEVICE(slcr), 0, 0xF8000000);
@@ -372,6 +388,7 @@ static void zynq_machine_class_init(ObjectClass *oc, void
*data)
NULL
};
MachineClass *mc = MACHINE_CLASS(oc);
+ ObjectProperty *prop;
mc->desc = "Xilinx Zynq Platform Baseboard for Cortex-A9";
mc->init = zynq_init;
mc->max_cpus = ZYNQ_MAX_CPUS;
@@ -379,6 +396,11 @@ static void zynq_machine_class_init(ObjectClass *oc, void
*data)
mc->ignore_memory_transaction_failures = true;
mc->valid_cpu_types = valid_cpu_types;
mc->default_ram_id = "zynq.ext_ram";
+ prop = object_class_property_add(oc, "boot-mode", "uint8_t", NULL,
+ zynq_set_boot_mode, NULL, NULL);
+ object_class_property_set_description(oc, "boot-mode",
+ "Update SLCR.BOOT_MODE register");
+ object_property_set_default_uint(prop, 1);
}
static const TypeInfo zynq_machine_type = {
--
2.34.1
