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Re: [PATCH 4/5] ppc405_boards: use qdev properties instead of legacy m48

From: BALATON Zoltan
Subject: Re: [PATCH 4/5] ppc405_boards: use qdev properties instead of legacy m48t59_init() function
Date: Sat, 17 Oct 2020 12:44:53 +0200 (CEST)

On Sat, 17 Oct 2020, Philippe Mathieu-Daudé wrote:
On 10/16/20 10:38 PM, BALATON Zoltan via wrote:
On Fri, 16 Oct 2020, Mark Cave-Ayland wrote:
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
hw/ppc/ppc405_boards.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/ppc405_boards.c b/hw/ppc/ppc405_boards.c
index 6198ec1035..4687715b15 100644
--- a/hw/ppc/ppc405_boards.c
+++ b/hw/ppc/ppc405_boards.c
@@ -28,6 +28,8 @@
#include "qemu-common.h"
#include "cpu.h"
#include "hw/ppc/ppc.h"
+#include "hw/qdev-properties.h"
+#include "hw/sysbus.h"
#include "ppc405.h"
#include "hw/rtc/m48t59.h"
#include "hw/block/flash.h"
@@ -145,6 +147,8 @@ static void ref405ep_init(MachineState *machine)
    char *filename;
    ppc4xx_bd_info_t bd;
    CPUPPCState *env;
+    DeviceState *dev;
+    SysBusDevice *s;
    qemu_irq *pic;
    MemoryRegion *bios;
    MemoryRegion *sram = g_new(MemoryRegion, 1);
@@ -227,7 +231,11 @@ static void ref405ep_init(MachineState *machine)
    /* Register FPGA */
    ref405ep_fpga_init(sysmem, 0xF0300000);
    /* Register NVRAM */
-    m48t59_init(NULL, 0xF0000000, 0, 8192, 1968, 8);
+    dev = qdev_new("sysbus-m48t08");
+    qdev_prop_set_int32(dev, "base-year", 1968);

Is there anything that uses other than 1968 as base year? If not this could be the default in the device so you don't need these set prop calls here and in sun machines.

The only other place this device is used seems to be ppc/prep machine that uses the isa version but does not set a base year. Is that a bug? The original prep machine removed in b2ce76a0730 used 2000 but that's unlikely as well as these machines predate that.


Anyway, the sysbus and isa versions are different

They shouldn't, it is the same chipset, wired differently.

I mean in QEMU the sysbus and isa devices are different object types so their default is settable independently. So setting the sysbus device base-year does not change the isa device which can be sorted out in another patch independently from this series later when the behaviour on 40p is confirmed.


so their default base-year could be set independently and then boards won't need to set this propery and may be could use qdev_create_simple instead or whatever that was renamed to.


Preferably following Zoltan's suggestion:
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>


+    s = SYS_BUS_DEVICE(dev);
+    sysbus_realize_and_unref(s, &error_fatal);
+    sysbus_mmio_map(s, 0, 0xF0000000);
    /* Load kernel */
    linux_boot = (kernel_filename != NULL);
    if (linux_boot) {

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