On 08.01.20 19:14, Philippe Mathieu-Daudé wrote:
> The hardware expects DIMM slots of 1 or 2 GB, allowing up to
> 4 GB of memory. Accept the same amount of memory the hardware
> can deal with.
>
> The CPU doesn't have access to the RAM mapped in the
> [0xf0000000 - 0xf1000000] range because this is the PDC area
> (Processor Dependent Code) where the firmware is loaded.
> To keep this region with higher priority than the RAM, lower
> the RAM priority. The PDC will overlap it.
>
> Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
> ---
> hw/hppa/machine.c | 11 +++++------
> 1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/hw/hppa/machine.c b/hw/hppa/machine.c
> index 6775d879f8..d10c967d06 100644
> --- a/hw/hppa/machine.c
> +++ b/hw/hppa/machine.c
> @@ -90,16 +90,15 @@ static void machine_hppa_init(MachineState *machine)
> g_free(name);
> }
>
> - /* Limit main memory. */
> - if (ram_size > FIRMWARE_START) {
> - machine->ram_size = ram_size = FIRMWARE_START;
> - }
> -
> /* Main memory region. */
> + if (machine->ram_size > 4 * GiB) {
> + error_report("RAM size of 4GB or more is not supported");
> + exit(EXIT_FAILURE);
> + }
My suggestion is to initially then limit it to max. 3GB, e.g.
> + if (machine->ram_size > 3 * GiB) {
> + error_report("RAM size of 3GB or more is not supported");
> + exit(EXIT_FAILURE);
That way you don't need to work around the 4GB SeaBIOS limitation
in your other RFC patch.
So, people can start it with:
qemu-system-hppa -m 3g -serial stdio
Later then we can fix SeaBIOS, at least if 64bit support gets added later on.
> ram_region = g_new(MemoryRegion, 1);
> memory_region_allocate_system_memory(ram_region, OBJECT(machine),
> "ram", ram_size);
^^^ here is still "ram_size". Do you need to change it?
> - memory_region_add_subregion(addr_space, 0, ram_region);
> + memory_region_add_subregion_overlap(addr_space, 0, ram_region, -1);
>
> /* Init Dino (PCI host bus chip). */
> pci_bus = dino_init(addr_space, &rtc_irq, &serial_irq);
>
Helge
