tree 363f9770417382cc4da72162a5a177e0a9143e00
parent e17d182ad3f797f01947fc234d95c96c050c534b
author Rajnesh Kanwal <rkanwal@rivosinc.com> 1675427374 +0000
committer Will Deacon <will@kernel.org> 1679679257 +0000

riscv: Move serial and rtc from IO port space to MMIO area.

The default serial and rtc IO region overlaps with PCI IO bar
region leading bar 0 activation to fail. Moving these devices
to MMIO region similar to ARM.

Given serial has been moved from 0x3f8 to 0x10000000, this
requires us to now pass earlycon=uart8250,mmio,0x10000000
from cmdline rather than earlycon=uart8250,mmio,0x3f8.

To avoid the need to change the address every time the tool
is updated, we can also just pass "earlycon" from cmdline
and guest then finds the type and base address by following
the Device Tree's stdout-path property.

Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com>
Tested-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20230203122934.18714-1-rkanwal@rivosinc.com
Signed-off-by: Will Deacon <will@kernel.org>