[v2,0/4] OpenRISC Device Tree Support

Message

Stafford Horne Feb. 10, 2022, 12:33 p.m. UTC

Changes since v1:
 - Fixed typos pointed out by Philippe
 - Moved usage of machine state to patch 3/4
 - added config dependency on FDT

This series adds device tree support for the OpenRISC SIM hardware.

The simulator will generate an FDT and pass it to the kernel.

For example:
  qemu-system-or1k -cpu or1200 -M or1k-sim \
    -kernel /home/shorne/work/linux/vmlinux \
    -initrd /home/shorne/work/linux/initramfs.cpio.gz \
    -serial mon:stdio -nographic -gdb tcp::10001 -m 32

Using the linux kernel or1ksim_defconfig we can remove the built-in
dts and the kernel will boot as expected.  The real benefit here is
being able to specify an external initrd which qemu will load into
memory and the device tree will tell the kernel where to find it.

Stafford Horne (4):
  hw/openrisc/openrisc_sim: Create machine state for or1ksim
  hw/openrisc/openrisc_sim: Parameterize initialization
  hw/openrisc/openrisc_sim; Add support for loading a device tree
  hw/openrisc/openrisc_sim: Add support for initrd loading

 configs/targets/or1k-softmmu.mak |   1 +
 hw/openrisc/openrisc_sim.c       | 261 +++++++++++++++++++++++++++++--
 2 files changed, 248 insertions(+), 14 deletions(-)