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X-OriginatorOrg: leica-geosystems.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jan 2023 11:36:32.8231 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d7907060-4740-493f-4e95-08daf3c816e5 X-MS-Exchange-CrossTenant-Id: 1b16ab3e-b8f6-4fe3-9f3e-2db7fe549f6a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=1b16ab3e-b8f6-4fe3-9f3e-2db7fe549f6a;Ip=[193.8.40.94];Helo=[aherlnxbspsrv01.lgs-net.com] X-MS-Exchange-CrossTenant-AuthSource: AM0EUR02FT015.eop-EUR02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR06MB8534 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230111_033637_355246_86900C7D X-CRM114-Status: GOOD ( 12.09 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ahmad Fatoum , Marcin Niestroj Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.9 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v4] ARM: rpi: parse memory from vc fdt X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) From: Marcin Niestroj Currently for RaspberryPi platform there is only one memory bank created, based on information fetched over mailbox. This is fine for booting Barebox, but unfortunately all the other memory banks are not propagated to Linux during boot, thus cannot be utilized. In fact, even when using /vc.dtb as device-tree for Linux, all memory nodes in FDT are deleted and new ones are created by Barebox by memory fixup mechanism, using exising RAM information. As a result RaspberryPi 4 boots Linux with 1GB RAM available, instead of 2GB (2 banks, each 1GB). At the end of VideoCore FDT parsing, do the same as of_probe_memory() in mem_initcall does, but for VideoCore provided devicetree/memory information. During Linux boot this information is used for memory fixup mechanism and in case of RaspberryPi 4 this results in 2 memory banks being propagated: # ls /proc/device-tree/memory* /proc/device-tree/memory@0: device_type name reg /proc/device-tree/memory@40000000: device_type name reg Signed-off-by: Marcin Niestroj Reviewed-by: Ahmad Fatoum Link: https://lore.barebox.org/20230110193251.2821638-1-m.niestroj@grinn-global.com Signed-off-by: Sascha Hauer --- arch/arm/boards/raspberry-pi/rpi-common.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/arm/boards/raspberry-pi/rpi-common.c b/arch/arm/boards/raspberry-pi/rpi-common.c index 77935e5c88..c6c7fd52bd 100644 --- a/arch/arm/boards/raspberry-pi/rpi-common.c +++ b/arch/arm/boards/raspberry-pi/rpi-common.c @@ -258,7 +258,7 @@ static u32 rpi_boot_mode, rpi_boot_part; static void rpi_vc_fdt_parse(void *fdt) { int ret; - struct device_node *root, *chosen, *bootloader; + struct device_node *root, *chosen, *bootloader, *memory; char *str; root = of_unflatten_dtb(fdt, INT_MAX); @@ -324,6 +324,16 @@ static void rpi_vc_fdt_parse(void *fdt) if (IS_ENABLED(CONFIG_RESET_SOURCE)) reset_source_set(rpi_decode_pm_rsts(chosen, bootloader)); + /* Parse all available nodes with "memory" device_type */ + memory = root; + while (1) { + memory = of_find_node_by_type(memory, "memory"); + if (!memory) + break; + + of_add_memory(memory, false); + } + out: if (root) of_delete_node(root); -- 2.25.1