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Date: Tue, 26 Mar 2024 00:40:17 +0800 From: Jisheng Zhang <jszhang@...nel.org> To: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de> Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: [PATCH 1/5] riscv: nommu: remove PAGE_OFFSET hardcoding Currently, PAGE_OFFSET is hardcoded as 0x8000_0000, it works fine since there's only one nommu platform in the mainline. However, there are many cases where the (S)DRAM base address isn't 0x8000_0000, so remove the hardcoding value, and introduce DRAM_BASE which will be set by users during configuring. DRAM_BASE is 0x8000_0000 by default. Signed-off-by: Jisheng Zhang <jszhang@...nel.org> --- arch/riscv/Kconfig | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 7895c77545f1..afd51dbdc253 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -247,10 +247,16 @@ config MMU Select if you want MMU-based virtualised addressing space support by paged memory management. If unsure, say 'Y'. +if !MMU +config DRAM_BASE + hex '(S)DRAM Base Address' + default 0x80000000 +endif + config PAGE_OFFSET hex default 0xC0000000 if 32BIT && MMU - default 0x80000000 if !MMU + default DRAM_BASE if !MMU default 0xff60000000000000 if 64BIT config KASAN_SHADOW_OFFSET -- 2.43.0
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