f795242f26
This CL adds a new board, QEMU/AArch64, for ARMv8. The machine supported is virt which is a QEMU 2.8 ARM virtual machine. The default CPU of qemu-system-aarch64 is Cortex-a15, so you need to specify a 64-bit cpu via a flag. To execute: $ qemu-system-aarch64 -M virt,secure=on,virtualization=on \ -cpu cortex-a53 -bios build/coreboot.rom -m 8192M -nographic Change-Id: Id7c0831b1ecf08785b4ec8139d809bad9b3e1eec Signed-off-by: Asami Doi <d0iasm.pub@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/33387 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Raul Rangel <rrangel@chromium.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
# QEMU AArch64 emulator
|
|
This page discribes how to build and run coreboot for QEMU/AArch64.
|
|
You can use LinuxBoot via `make menuconfig` or an arbitrary FIT image
|
|
as a payload for QEMU/AArch64.
|
|
|
|
## Running coreboot in QEMU
|
|
```bash
|
|
qemu-system-aarch64 -bios ./build/coreboot.rom \
|
|
-M virt,secure=on,virtualization=on -cpu cortex-a53 \
|
|
-nographic -m 8912M
|
|
```
|
|
|
|
- The default CPU in QEMU for AArch64 is a cortex-a15 which is 32-bit
|
|
ARM CPU. You need to specify 64-bit ARM CPU via `-cpu cortex-a53`.
|
|
- The default privilege level in QEMU for AArch64 is EL1 that we can't
|
|
have the right to access EL3/EL2 registers. You need to enable EL3/EL2
|
|
via `-machine secure=on,virtualization=on`.
|
|
- You need to specify the size of memory more than 544 MiB because 512
|
|
MiB is reserved for the kernel.
|
|
|
|
## Building coreboot with an arbitrary FIT payload
|
|
There are 3 steps to make coreboot.rom for QEMU/AArch64. If you select
|
|
LinuxBoot, step 2 and 3 have done by LinuxBoot.
|
|
1. Get a DTB (Device Tree Blob)
|
|
2. Build a FIT image with a DTB
|
|
3. Add a FIT image to coreboot.rom
|
|
|
|
### 1. Get a DTB
|
|
You can get the DTB from QEMU with the following command.
|
|
```
|
|
$ qemu-system-aarch64 \
|
|
-M virt,dumpdtb=virt.dtb,secure=on,virtualization=on \
|
|
-cpu cortex-a53 -nographic -m 2048M
|
|
```
|
|
|
|
### 2. Build a FIT image with a DTB
|
|
You need to write an image source file that has an `.its` extension to
|
|
configure kernels, ramdisks, and DTBs.
|
|
See [Flattened uImage Tree documentation](../../lib/payloads/fit.md) for more details.
|
|
|
|
### 3. Add a FIT image to coreboot.rom
|
|
You can use cbfstool to add the payload you created in step 2 to
|
|
the coreboot.rom.
|
|
```
|
|
$ ./build/cbfstool ./build/coreboot.rom add -f <path-to-a-payload>/uImage \
|
|
-n fallback/payload -t fit -c lzma
|
|
```
|