From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-lj1-x241.google.com ([2a00:1450:4864:20::241]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jgMlX-0005N5-LU for barebox@lists.infradead.org; Wed, 03 Jun 2020 06:20:44 +0000 Received: by mail-lj1-x241.google.com with SMTP id c17so1183223lji.11 for ; Tue, 02 Jun 2020 23:20:42 -0700 (PDT) From: Antony Pavlov Date: Wed, 3 Jun 2020 09:20:32 +0300 Message-Id: <20200603062032.15288-1-antonynpavlov@gmail.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH] MIPS: correctly work with disabled CONFIG_MMU To: barebox@lists.infradead.org Cc: Oleksij Rempel There are some issues with CONFIG_MMU=n in MIPS configuration (e.g. qemu-malta_defconfig): * "Cannot request SDRAM region for stack" error message on start; * empty kseg1_ram0 region in the iomem command output. The patch fixes the problems by forcing KSEG1 memory region usage for CONFIG_MMU=n MIPS configurations. Signed-off-by: Antony Pavlov --- arch/mips/include/asm/io.h | 6 +++++- arch/mips/lib/reloc.c | 6 +++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h index c155199430..4df9853680 100644 --- a/arch/mips/include/asm/io.h +++ b/arch/mips/include/asm/io.h @@ -39,7 +39,11 @@ static inline unsigned long virt_to_phys(const void *address) */ static inline void *phys_to_virt(unsigned long address) { - return (void *)CKSEG0ADDR(address); + if (IS_ENABLED(CONFIG_MMU)) { + return (void *)CKSEG0ADDR(address); + } + + return (void *)CKSEG1ADDR(address); } #define IO_SPACE_LIMIT 0 diff --git a/arch/mips/lib/reloc.c b/arch/mips/lib/reloc.c index 4b0e252352..b084a88be7 100644 --- a/arch/mips/lib/reloc.c +++ b/arch/mips/lib/reloc.c @@ -120,7 +120,11 @@ void relocate_code(void *fdt, u32 fdt_size, u32 ram_size) length = __bss_stop - __image_start; relocaddr = ALIGN_DOWN(ram_size - length, SZ_64K); - relocaddr = KSEG0ADDR(relocaddr); + if (IS_ENABLED(CONFIG_MMU)) { + relocaddr = KSEG0ADDR(relocaddr); + } else { + relocaddr = KSEG1ADDR(relocaddr); + } new_stack = relocaddr - MALLOC_SIZE - 16; /* -- 2.26.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox