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dt: Add -machine dumpdtb option to dump the current dtb

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Now that we are dynamically creating the dtb, it's really useful to
be able to dump the created blob for debugging.

This patch implements a -machine dumpdtb=<file> option for e500 that
dumps the dtb exactly in the form the guest would get it to disk. It
can then be analyzed by dtc to get information about the guest
configuration.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2012-05-18 00:11:33 +02:00
parent 2636fcb653
commit 25b42708cd
2 changed files with 22 additions and 0 deletions
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18
hw/ppce500_mpc8544ds.c
View File

@ -111,6 +111,8 @@ static int mpc8544_load_device_tree(CPUPPCState *env,
uint32_t pci_ranges[12] = { 0x2000000, 0x0, 0xc0000000, 0xc0000000, 0x0,
0x20000000, 0x1000000, 0x0, 0x0, 0xe1000000,
0x0, 0x10000 };
QemuOpts *machine_opts;
const char *dumpdtb = NULL;
fdt = create_device_tree(&fdt_size);
if (fdt == NULL) {
@ -300,6 +302,22 @@ static int mpc8544_load_device_tree(CPUPPCState *env,
qemu_devtree_setprop_cell(fdt, pci, "#address-cells", 3);
qemu_devtree_setprop_string(fdt, "/aliases", "pci0", pci);
machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
if (machine_opts) {
dumpdtb = qemu_opt_get(machine_opts, "dumpdtb");
}
if (dumpdtb) {
/* Dump the dtb to a file and quit */
FILE *f = fopen(dumpdtb, "wb");
size_t len;
len = fwrite(fdt, fdt_size, 1, f);
fclose(f);
if (len != fdt_size) {
exit(1);
}
exit(0);
}
ret = rom_add_blob_fixed(BINARY_DEVICE_TREE_FILE, fdt, fdt_size, addr);
if (ret < 0) {
goto out;

4
qemu-config.c
View File

@ -583,6 +583,10 @@ static QemuOptsList qemu_machine_opts = {
.name = "dtb",
.type = QEMU_OPT_STRING,
.help = "Linux kernel device tree file",
}, {
.name = "dumpdtb",
.type = QEMU_OPT_STRING,
.help = "Dump current dtb to a file and quit",
},
{ /* End of list */ }
},