diff options
| author | Xiaojuan Yang <yangxiaojuan@loongson.cn> | 2022-10-28 09:40:05 +0800 |
|---|---|---|
| committer | Song Gao <gaosong@loongson.cn> | 2022-11-04 17:07:40 +0800 |
| commit | 021836936ef90fe1e52fe7ab7b7f2bcb9a66368a (patch) | |
| tree | 27b6cd58ab4df5981ac51b14f5cc7d9ebf053d53 /hw/loongarch | |
| parent | a649fffcc9589a88464474e9105798eb62023352 (diff) | |
hw/loongarch: Load FDT table into dram memory space
Load FDT table into dram memory space, and the addr is 2 MiB.
Since lowmem region starts from 0, FDT base address is located
at 2 MiB to avoid NULL pointer access.
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Acked-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20221028014007.2718352-2-yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Diffstat (limited to 'hw/loongarch')
| -rw-r--r-- | hw/loongarch/virt.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c index 4b595a9ea4..50e9829a94 100644 --- a/hw/loongarch/virt.c +++ b/hw/loongarch/virt.c @@ -159,7 +159,6 @@ static void fdt_add_pcie_node(const LoongArchMachineState *lams) 1, FDT_PCI_RANGE_MMIO, 2, base_mmio, 2, base_mmio, 2, size_mmio); g_free(nodename); - qemu_fdt_dumpdtb(ms->fdt, lams->fdt_size); } static void fdt_add_irqchip_node(LoongArchMachineState *lams) @@ -656,6 +655,7 @@ static void loongarch_init(MachineState *machine) MemoryRegion *address_space_mem = get_system_memory(); LoongArchMachineState *lams = LOONGARCH_MACHINE(machine); int i; + hwaddr fdt_base; if (!cpu_model) { cpu_model = LOONGARCH_CPU_TYPE_NAME("la464"); @@ -760,12 +760,16 @@ static void loongarch_init(MachineState *machine) lams->machine_done.notify = virt_machine_done; qemu_add_machine_init_done_notifier(&lams->machine_done); fdt_add_pcie_node(lams); - - /* load fdt */ - MemoryRegion *fdt_rom = g_new(MemoryRegion, 1); - memory_region_init_rom(fdt_rom, NULL, "fdt", VIRT_FDT_SIZE, &error_fatal); - memory_region_add_subregion(get_system_memory(), VIRT_FDT_BASE, fdt_rom); - rom_add_blob_fixed("fdt", machine->fdt, lams->fdt_size, VIRT_FDT_BASE); + /* + * Since lowmem region starts from 0, FDT base address is located + * at 2 MiB to avoid NULL pointer access. + * + * Put the FDT into the memory map as a ROM image: this will ensure + * the FDT is copied again upon reset, even if addr points into RAM. + */ + fdt_base = 2 * MiB; + qemu_fdt_dumpdtb(machine->fdt, lams->fdt_size); + rom_add_blob_fixed("fdt", machine->fdt, lams->fdt_size, fdt_base); } bool loongarch_is_acpi_enabled(LoongArchMachineState *lams) |