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q800: add a block backend to the PRAM

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This allows to save and restore the content of the PRAM.
It may be useful if we want to check the configuration or to change it.

The backend is added using mtd interface, for instance:

    ... -drive file=pram.img,format=raw,if=mtd ...

where pram.img is the file where the data will be stored, its size must
be 256 bytes.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20191219201439.84804-3-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2019-12-19 21:14:39 +01:00
parent b2619c158a
commit eb064db94c
3 changed files with 74 additions and 0 deletions
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6
hw/m68k/q800.c
View file

@ -158,6 +158,7 @@ static void q800_init(MachineState *machine)
NubusBus *nubus;
GLUEState *irq;
qemu_irq *pic;
DriveInfo *dinfo;
linux_boot = (kernel_filename != NULL);
@ -200,6 +201,11 @@ static void q800_init(MachineState *machine)
/* VIA */
via_dev = qdev_create(NULL, TYPE_MAC_VIA);
dinfo = drive_get(IF_MTD, 0, 0);
if (dinfo) {
qdev_prop_set_drive(via_dev, "drive", blk_by_legacy_dinfo(dinfo),
&error_abort);
}
qdev_init_nofail(via_dev);
sysbus = SYS_BUS_DEVICE(via_dev);
sysbus_mmio_map(sysbus, 0, VIA_BASE);