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Re: [PATCH 0/2] Implement a grub loader for RISC-V LINUX

From: Atish Patra
Subject: Re: [PATCH 0/2] Implement a grub loader for RISC-V LINUX
Date: Thu, 16 Jan 2020 13:14:39 +0000

Sent from my iPhone

> On Jan 16, 2020, at 10:06 PM, Alexander Graf <address@hidden> wrote:
> Hi Chester,
>> On 16.01.20 11:21, Chester Lin wrote:
>> Implement an initial version of riscv loader and related commands to load
>> and run linux kernel and initrd on RISC-V. I tested this series based on
>> the following configuration:
>>   - QEMU 4.2.50 (machine: virt)
>>   - OpenSBI v0.5-51
>>   - U-Boot 2020.01-rc5
>>   - grub 2.04
>>   - linux-kernel v5.4
>>   - openSUSE-Tumbleweed-20191103
> Thanks a lot for tackling this problem - it's been on the back burner for way 
> too long :). Unfortunately this patch set loads grub via UEFI, but then does 
> not execute Linux using the UEFI protocol. While that's a nice hack for 
> starters, it severely limits the extensibility of the boot flow going forward.
> IIRC either Anup or Atish wanted to work on a UEFI boot stub for Linux. We 
> could then just unify the ARM and RISC-V UEFI boot paths in grub and use that 
> common code to run Linux via the UEFI stub.

Yes. I am working on it. In fact, I got Linux kernel booting via bootefi 
command last week. I have tried to use as much as ARM stub code possible which 
will help in unifying them in future.

I am yet to add UEFI run time services. But I was thinking to post a RFC series 
with EFI stub code first and work on run time services after that. Let me know 
if you think that’s not a good idea.

> Thanks,
> Alex

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