On Thu, 17 Dec 2020 13:48:26 PST (-0800), Atish Patra wrote:
> Currently, we place the DTB at 2MB from 4GB or end of DRAM which
> ever is
> lesser. However, Linux kernel can address only 1GB of memory for
> Thus, it can not map anything beyond 3GB (assuming 2GB is the
> starting address).
> As a result, it can not process DT and panic if opensbi dynamic
> is used.
> Fix this by placing the DTB at 2MB from 3GB or end of DRAM
> whichever is lower.
> Signed-off-by: Atish Patra <firstname.lastname@example.org>
> hw/riscv/boot.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
> diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c
> index d62f3dc7581e..9e77b22e4d56 100644
> --- a/hw/riscv/boot.c
> +++ b/hw/riscv/boot.c
> @@ -203,9 +203,9 @@ uint32_t riscv_load_fdt(hwaddr dram_base,
> uint64_t mem_size, void *fdt)
> * We should put fdt as far as possible to avoid kernel/initrd
> * its content. But it should be addressable by 32 bit system
> as well.
> * Thus, put it at an aligned address that less than fdt size
> from end of
> - * dram or 4GB whichever is lesser.
> + * dram or 3GB whichever is lesser.
> - temp = MIN(dram_end, 4096 * MiB);
> + temp = MIN(dram_end, 3072 * MiB);
> fdt_addr = QEMU_ALIGN_DOWN(temp - fdtsize, 2 * MiB);
Presumably this was the cause of that 32-bit boot issue?