linux-kernel - [RFC PATCH 0/3] riscv: Add riscv.fwsz kernel parameter to save memory

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Date:   Tue, 23 Nov 2021 09:57:14 +0800
From:   guoren@...nel.org
To:     guoren@...nel.org, anup@...infault.org, palmer@...belt.com,
        atishp@...osinc.com
Cc:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-doc@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: [RFC PATCH 0/3] riscv: Add riscv.fwsz kernel parameter to save memory

From: Guo Ren <guoren@...ux.alibaba.com>

The firmware of riscv (such as opensbi) occupy 2MB(64bit) /
4MB(32bit) in Linux. It's very wasteful to small memory footprint
soc chip such as Allwinner D1s/F133. The kernel parameter gives a
chance to users to set the proper size of the firmware and get
more than 1.5MB of memory.

Guo Ren (3):
  riscv: Remove 2MB offset in the mm layout
  riscv: Add early_param to decrease firmware region
  riscv: Add riscv.fwsz kernel parameter

 .../admin-guide/kernel-parameters.txt         |  3 +++
 arch/riscv/include/asm/page.h                 |  8 +++++++
 arch/riscv/kernel/head.S                      | 10 +++-----
 arch/riscv/kernel/vmlinux.lds.S               |  5 ++--
 arch/riscv/mm/init.c                          | 23 ++++++++++++++++---
 5 files changed, 36 insertions(+), 13 deletions(-)

-- 
2.25.1