linux-kernel - [PATCH 0/2] ARM: support PHYS_OFFSET minimum aligned at 64KiB boundary

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Message-ID: <20200915015204.2971-1-thunder.leizhen@huawei.com>
Date:   Tue, 15 Sep 2020 09:52:02 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Santosh Shilimkar <santosh.shilimkar@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        Libin <huawei.libin@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Jianguo Chen <chenjianguo3@...wei.com>
Subject: [PATCH 0/2] ARM: support PHYS_OFFSET minimum aligned at 64KiB boundary

Currently, only support the kernels where the base of physical memory is
at a 16MiB boundary. Because the add/sub instructions only contains 8bits
unrotated value. But we can use one more "add/sub" instructions to handle
bits 23-16, to support PHYS_OFFSET minimum aligned at 64KiB boundary.

This function is required at least by some Huawei boards, such as Hi1380
board. Becuase the kernel Image is loaded at 2MiB boundary.

Zhen Lei (2):
  ARM: fix trivial comments in head.S
  ARM: support PHYS_OFFSET minimum aligned at 64KiB boundary

 arch/arm/Kconfig              | 18 +++++++++++++++++-
 arch/arm/include/asm/memory.h | 16 +++++++++++++---
 arch/arm/kernel/head.S        | 31 ++++++++++++++++++++++---------
 3 files changed, 52 insertions(+), 13 deletions(-)

-- 
1.8.3