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Thu, 19 Jan 2023 10:09:27 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.9.0-alpha0-85-gd6d859e0cf-fm-20230116.001-gd6d859e0 Mime-Version: 1.0 Message-Id: In-Reply-To: <20230119144236.3541751-10-alexander.stein@ew.tq-group.com> References: <20230119144236.3541751-1-alexander.stein@ew.tq-group.com> <20230119144236.3541751-10-alexander.stein@ew.tq-group.com> Date: Thu, 19 Jan 2023 16:09:05 +0100 From: "Arnd Bergmann" To: "Alexander Stein" , "Rob Herring" , "Krzysztof Kozlowski" , "Olof Johansson" , "Shawn Guo" , "Li Yang" , "Russell King" , "Marek Vasut" , "Marcel Ziswiler" Cc: soc@kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 9/9] [DNI] ARM: multi_v7_defconfig: Enable CONFIG_ARM_LPAE for multi_v7_config X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230119_070935_857544_E3C984FA X-CRM114-Status: GOOD ( 12.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Thu, Jan 19, 2023, at 15:42, Alexander Stein wrote: > This is necessary to support PCIe on LS1021A. > > Signed-off-by: Alexander Stein Can you explain why this is actually required? I can see that the ranges in the PCIe device point to a high address (0x4000000000, 2^40), but I can't tell if this is hardwired in the SoC or a setting that is applied by software (either the bootloader or the PCIe driver). If you can reprogram the memory map, I would expect this to fit easily into the 32-bit address space, with 1GB for DDR3 memory and 1GB for PCIe BARs. I don't mind having a defconfig with LPAE enabled, I think this can be done using a Makefile target that applies a config fragment on top of the normal multi_v7_defconfig, you can find some examples in arch/powerpc/configs/*.config. Arnd _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel