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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:47588) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kzneq-0001gv-IX; Wed, 13 Jan 2021 21:26:24 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1kzneo-0007dl-RD; Wed, 13 Jan 2021 21:26:22 +0000 Date: Wed, 13 Jan 2021 21:26:22 +0000 From: Russell King - ARM Linux admin To: Ard Biesheuvel Subject: Re: [PATCH 2/2] ARM: axxia: remove TEXT_OFFSET override hack Message-ID: <20210113212622.GK1551@shell.armlinux.org.uk> References: <20210111103020.32372-1-ardb@kernel.org> <20210111103020.32372-3-ardb@kernel.org> <75ce53f2-a216-418d-9055-f6f3dc504a26@nokia.com> <0fbf530e-d0ad-a124-dae5-255ecd8ef9a9@nokia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210113_162931_659445_C50F3216 X-CRM114-Status: GOOD ( 14.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Linus Walleij , Geert Uytterhoeven , Alexander Sverdlin , Arnd Bergmann , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jan 13, 2021 at 06:49:17PM +0100, Ard Biesheuvel wrote: > If you are going to fix the bootloader, better to let it relocate > itself to the top of DRAM as is usually done. > > The boot requirements [0] state that the uncompressed image must be > placed TEXT_OFFSET - PAGE_OFFSET bytes from the start of system No, that is incorrect on several counts. 1. PAGE_OFFSET is the virtual address offset of the start of RAM as seen by the kernel; the boot loader has no knowledge of this. You mean essentially what the kernel calls PHYS_OFFSET. 2. TEXT_OFFSET is the offset from the start of RAM to the kernel image both in terms of what the kernel calls PAGE_OFFSET and PHYS_OFFSET. Essentially, the page mapped at PAGE_OFFSET in the kernel's virtual address space is the physical page at PHYS_OFFSET when the MMU is off. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel