attached is a tested 0.12.3-version of an old patch
http://xenon.stanford.edu/~eswierk/misc/qemu-linuxbios/qemu-piix-ram-size.patch
that together with
http://www.mail-archive.com/linuxb...@linuxbios.org/msg02390.html
(which is already in coreboot trunk) allows coreboot BIOS to autodetect the
amount of RAM within qemu/kvm from a register in i440 northbridge.
The message on the old patch states:
Unfortunately the current version of qemu does not set these
registers, but I have patched qemu so that it emulates the i440 more
faithfully in this regard.
new patch is also available at
http://www.zq1.de/~bernhard/linux/qemu-0.12.3-piix-ram-size.patch
Please discuss or apply this patch.
regards
Bernhard M. Wiedemann
--
software engineer
diff -ru ./hw/pc.c ../qpatch/hw/pc.c
--- ./hw/pc.c 2010-02-26 03:34:00.000000000 +0100
+++ ../qpatch/hw/pc.c 2010-04-19 17:18:12.000000000 +0200
@@ -1130,7 +1130,7 @@
}
if (pci_enabled) {
- pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, isa_irq);
+ pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, isa_irq, ram_size);
} else {
pci_bus = NULL;
isa_bus_new(NULL);
diff -ru ./hw/pc.h ../qpatch/hw/pc.h
--- ./hw/pc.h 2010-02-26 03:34:00.000000000 +0100
+++ ../qpatch/hw/pc.h 2010-04-19 17:10:50.000000000 +0200
@@ -129,7 +129,7 @@
struct PCII440FXState;
typedef struct PCII440FXState PCII440FXState;
-PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn, qemu_irq *pic);
+PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn, qemu_irq *pic, int ram_size);
void i440fx_set_smm(PCII440FXState *d, int val);
void i440fx_init_memory_mappings(PCII440FXState *d);
diff -ru ./hw/piix_pci.c ../qpatch/hw/piix_pci.c
--- ./hw/piix_pci.c 2010-02-26 03:34:00.000000000 +0100
+++ ../qpatch/hw/piix_pci.c 2010-04-19 17:27:59.000000000 +0200
@@ -209,7 +209,7 @@
static PIIX3State *piix3_dev;
-PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn, qemu_irq *pic)
+PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn, qemu_irq *pic, int ram_size)
{
DeviceState *dev;
PCIBus *b;
@@ -236,6 +236,11 @@
piix3_dev = piix3;
+ ram_size = ram_size / 8 / 1024 / 1024;
+ if (ram_size > 255)
+ ram_size = 255;
+ (*pi440fx_state)->dev.config[0x57]=ram_size;
+
return b;
}
