[coreboot-gerrit] [M] Change in coreboot[main]: riscv/mb/qemu: fix DRAM probing

[Philipp Hug (Code Review)]

Attention is currently required from: Arthur Heymans, Philipp Hug.

Hello Arthur Heymans, Marc Karasek, Martin L Roth, build bot (Jenkins), ron minnich,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/36486?usp=email

to look at the new patch set (#5).

Change subject: riscv/mb/qemu: fix DRAM probing
......................................................................

riscv/mb/qemu: fix DRAM probing

Current version of qemu raise an exception when accessing invalid memory.
Modify the probing code to temporary redirect the exception handler like on
ARM platform.

TEST=qemu detects RAM size correctly
Change-Id: I25860f688c7546714f6fdbce8c8f96da6400813c
Signed-off-by: Philipp Hug 
Signed-off-by: Arthur Heymans 
---
M src/arch/riscv/Makefile.mk
M src/arch/riscv/include/arch/exception.h
A src/arch/riscv/ramdetect.c
M src/arch/riscv/trap_handler.c
M src/arch/riscv/trap_util.S
M src/lib/imd_cbmem.c
M src/lib/ramdetect.c
7 files changed, 59 insertions(+), 4 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/86/36486/5