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From: Jesse Taube <mr.bossman075@gmail.com>
To: linux-riscv@lists.infradead.org
Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
	Jesse Taube <Mr.Bossman075@gmail.com>,
	Yimin Gu <ustcymgu@gmail.com>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Waldemar Brodkorb <wbx@openadk.org>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>
Subject: [PATCH v3 2/3] riscv: Kconfig: Allow RV32 to build with no MMU
Date: Tue, 28 Feb 2023 19:26:56 -0500	[thread overview]
Message-ID: <20230301002657.352637-3-Mr.Bossman075@gmail.com> (raw)
In-Reply-To: <20230301002657.352637-1-Mr.Bossman075@gmail.com>

From: Yimin Gu <ustcymgu@gmail.com>

Some RISC-V 32bit cores do not have an MMU, and the kernel should be
able to build for them. This patch enables the RV32 to be built with
no MMU support.

Signed-off-by: Yimin Gu <ustcymgu@gmail.com>
CC: Jesse Taube <Mr.Bossman075@gmail.com>
Tested-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
---
V1->V2:
 - Fix typo in commit description
V2->V3:
 - No change
---
 arch/riscv/Kconfig | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index c5e42cc37604..d1f661425790 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -177,8 +177,8 @@ config MMU
 
 config PAGE_OFFSET
 	hex
-	default 0xC0000000 if 32BIT
-	default 0x80000000 if 64BIT && !MMU
+	default 0xC0000000 if 32BIT && MMU
+	default 0x80000000 if !MMU
 	default 0xff60000000000000 if 64BIT
 
 config KASAN_SHADOW_OFFSET
@@ -279,7 +279,6 @@ config ARCH_RV32I
 	select GENERIC_LIB_ASHRDI3
 	select GENERIC_LIB_LSHRDI3
 	select GENERIC_LIB_UCMPDI2
-	select MMU
 
 config ARCH_RV64I
 	bool "RV64I"
-- 
2.39.0


WARNING: multiple messages have this Message-ID (diff)
From: Jesse Taube <mr.bossman075@gmail.com>
To: linux-riscv@lists.infradead.org
Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
	Jesse Taube <Mr.Bossman075@gmail.com>,
	Yimin Gu <ustcymgu@gmail.com>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Waldemar Brodkorb <wbx@openadk.org>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>
Subject: [PATCH v3 2/3] riscv: Kconfig: Allow RV32 to build with no MMU
Date: Tue, 28 Feb 2023 19:26:56 -0500	[thread overview]
Message-ID: <20230301002657.352637-3-Mr.Bossman075@gmail.com> (raw)
In-Reply-To: <20230301002657.352637-1-Mr.Bossman075@gmail.com>

From: Yimin Gu <ustcymgu@gmail.com>

Some RISC-V 32bit cores do not have an MMU, and the kernel should be
able to build for them. This patch enables the RV32 to be built with
no MMU support.

Signed-off-by: Yimin Gu <ustcymgu@gmail.com>
CC: Jesse Taube <Mr.Bossman075@gmail.com>
Tested-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
---
V1->V2:
 - Fix typo in commit description
V2->V3:
 - No change
---
 arch/riscv/Kconfig | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index c5e42cc37604..d1f661425790 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -177,8 +177,8 @@ config MMU
 
 config PAGE_OFFSET
 	hex
-	default 0xC0000000 if 32BIT
-	default 0x80000000 if 64BIT && !MMU
+	default 0xC0000000 if 32BIT && MMU
+	default 0x80000000 if !MMU
 	default 0xff60000000000000 if 64BIT
 
 config KASAN_SHADOW_OFFSET
@@ -279,7 +279,6 @@ config ARCH_RV32I
 	select GENERIC_LIB_ASHRDI3
 	select GENERIC_LIB_LSHRDI3
 	select GENERIC_LIB_UCMPDI2
-	select MMU
 
 config ARCH_RV64I
 	bool "RV64I"
-- 
2.39.0


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  parent reply	other threads:[~2023-03-01  0:27 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-01  0:26 [PATCH v3 0/3] Add RISC-V 32 NOMMU support Jesse Taube
2023-03-01  0:26 ` Jesse Taube
2023-03-01  0:26 ` [PATCH v3 1/3] clk: k210: remove an implicit 64-bit division Jesse Taube
2023-03-01  0:26   ` Jesse Taube
2023-03-01  1:19   ` Damien Le Moal
2023-03-01  1:19     ` Damien Le Moal
2023-03-06 22:31   ` Stephen Boyd
2023-03-06 22:31     ` Stephen Boyd
2023-03-06 22:35     ` Conor Dooley
2023-03-06 22:35       ` Conor Dooley
2023-03-06 22:37       ` Stephen Boyd
2023-03-06 22:37         ` Stephen Boyd
2023-03-06 22:41   ` Stephen Boyd
2023-03-06 22:41     ` Stephen Boyd
2023-03-06 22:48     ` Palmer Dabbelt
2023-03-06 22:48       ` Palmer Dabbelt
2023-03-01  0:26 ` Jesse Taube [this message]
2023-03-01  0:26   ` [PATCH v3 2/3] riscv: Kconfig: Allow RV32 to build with no MMU Jesse Taube
2023-03-01  1:22   ` Damien Le Moal
2023-03-01  1:22     ` Damien Le Moal
2023-03-01  0:26 ` [PATCH v3 3/3] riscv: configs: Add nommu PHONY defconfig for RV32 Jesse Taube
2023-03-01  0:26   ` Jesse Taube
2023-03-01  4:07 ` [PATCH v3 0/3] Add RISC-V 32 NOMMU support Randy Dunlap
2023-03-01  4:07   ` Randy Dunlap
2023-03-01  4:42   ` Damien Le Moal
2023-03-01  4:42     ` Damien Le Moal
2023-03-08  1:26     ` Jesse Taube
2023-03-08  1:26       ` Jesse Taube
2023-03-08  2:16       ` Randy Dunlap
2023-03-08  2:16         ` Randy Dunlap
2023-03-08  2:30         ` Jesse Taube
2023-03-08  2:30           ` Jesse Taube
2023-03-08  2:33           ` Randy Dunlap
2023-03-08  2:33             ` Randy Dunlap
2023-03-08  2:51             ` Randy Dunlap
2023-03-08  2:51               ` Randy Dunlap
2023-03-08  2:54               ` Jesse Taube
2023-03-08  2:54                 ` Jesse Taube
2023-03-08  3:23                 ` Randy Dunlap
2023-03-08  3:23                   ` Randy Dunlap
2023-03-08  3:42                   ` Damien Le Moal
2023-03-08  3:42                     ` Damien Le Moal
2023-03-08  3:46                     ` Jesse Taube
2023-03-08  3:46                       ` Jesse Taube
2023-03-08  4:11                       ` Damien Le Moal
2023-03-08  4:11                         ` Damien Le Moal
2023-03-14 18:35                         ` Jesse Taube
2023-03-14 18:35                           ` Jesse Taube
2023-03-14 19:16                           ` Conor Dooley
2023-03-14 19:16                             ` Conor Dooley
2023-03-08  3:51                     ` Randy Dunlap
2023-03-08  3:51                       ` Randy Dunlap
2023-03-25 11:57 ` Conor Dooley
2023-03-25 11:57   ` Conor Dooley
2023-03-28 18:50 ` (subset) " Palmer Dabbelt
2023-03-28 18:50   ` Palmer Dabbelt

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