{"id":2218886,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2218886/?format=json","project":{"id":18,"url":"http://patchwork.ozlabs.org/api/1.0/projects/18/?format=json","name":"U-Boot","link_name":"uboot","list_id":"u-boot.lists.denx.de","list_email":"u-boot@lists.denx.de","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260402001410.3736815-2-rs@ti.com>","date":"2026-04-02T00:14:05","name":"[1/6] lmb: add LMB_FDT for fdt reserved regions","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"46e8985e7b6d2df07468f5e174e000bf54c96168","submitter":{"id":88727,"url":"http://patchwork.ozlabs.org/api/1.0/people/88727/?format=json","name":"Randolph Sapp","email":"rs@ti.com"},"delegate":{"id":68728,"url":"http://patchwork.ozlabs.org/api/1.0/users/68728/?format=json","username":"xypron","first_name":"Heinrich","last_name":"Schuchardt","email":"xypron.glpk@gmx.de"},"mbox":"http://patchwork.ozlabs.org/project/uboot/patch/20260402001410.3736815-2-rs@ti.com/mbox/","series":[{"id":498412,"url":"http://patchwork.ozlabs.org/api/1.0/series/498412/?format=json","date":"2026-04-02T00:14:04","name":"various memory related fixups","version":1,"mbox":"http://patchwork.ozlabs.org/series/498412/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2218886/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=ti.com header.i=@ti.com header.a=rsa-sha256\n header.s=selector1 header.b=jZNg+YLV;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; 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helo=lewvzet200.ext.ti.com; pr=C","From":"","To":", ,\n , , ,\n , , ,\n ","CC":"","Subject":"[PATCH 1/6] lmb: add LMB_FDT for fdt reserved regions","Date":"Wed, 1 Apr 2026 19:14:05 -0500","Message-ID":"<20260402001410.3736815-2-rs@ti.com>","X-Mailer":"git-send-email 2.53.0","In-Reply-To":"<20260402001410.3736815-1-rs@ti.com>","References":"<20260402001410.3736815-1-rs@ti.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-C2ProcessedOrg":"333ef613-75bf-4e12-a4b1-8e3623f5dcea","X-EOPAttributedMessage":"0","X-MS-PublicTrafficType":"Email","X-MS-TrafficTypeDiagnostic":"SJ1PEPF00001CE5:EE_|DS5PR10MB997707:EE_","X-MS-Office365-Filtering-Correlation-Id":"dfcdcb49-dc40-456b-35e2-08de904cd567","X-MS-Exchange-SenderADCheck":"1","X-MS-Exchange-AntiSpam-Relay":"0","X-Microsoft-Antispam":"BCL:0;\n ARA:13230040|82310400026|1800799024|36860700016|376014|22082099003|56012099003|18002099003;","X-Microsoft-Antispam-Message-Info":"\n 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","X-Forefront-Antispam-Report":"CIP:198.47.23.194; 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Ip=[198.47.23.194];\n Helo=[lewvzet200.ext.ti.com]","X-MS-Exchange-CrossTenant-AuthSource":"\n SJ1PEPF00001CE5.namprd03.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Anonymous","X-MS-Exchange-CrossTenant-FromEntityHeader":"HybridOnPrem","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"DS5PR10MB997707","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"},"content":"From: Randolph Sapp \n\nAdd an LMB_FDT bit for fdt reserved regions, so we can reclaim them when\nparsing a new device tree and properly warn people when a reservation\noverlaps with an existing allocation.\n\nIf we don't at least warn the user of these reservation failures,\nthere's a chance that this region could be freed and reallocated for\nsomething important later.\n\nThis useful warning mechanism was broken in:\n5a6aa7d5913 (\"boot: fdt: Handle already reserved memory in boot_fdt_reserve_region()\")\n\nSigned-off-by: Randolph Sapp \n---\n boot/image-fdt.c | 5 ++++-\n include/lmb.h | 7 +++++++\n lib/lmb.c | 23 +++++++++++++++++++++++\n 3 files changed, 34 insertions(+), 1 deletion(-)","diff":"diff --git a/boot/image-fdt.c b/boot/image-fdt.c\nindex a3a4fb8b558..0f5857f24d2 100644\n--- a/boot/image-fdt.c\n+++ b/boot/image-fdt.c\n@@ -73,6 +73,7 @@ static void boot_fdt_reserve_region(u64 addr, u64 size, u32 flags)\n {\n \tlong ret;\n \tphys_addr_t rsv_addr;\n+\tflags |= LMB_FDT;\n \n \trsv_addr = (phys_addr_t)addr;\n \tret = lmb_alloc_mem(LMB_MEM_ALLOC_ADDR, 0, &rsv_addr, size, flags);\n@@ -80,7 +81,7 @@ static void boot_fdt_reserve_region(u64 addr, u64 size, u32 flags)\n \t\tdebug(\" reserving fdt memory region: addr=%llx size=%llx flags=%x\\n\",\n \t\t (unsigned long long)addr,\n \t\t (unsigned long long)size, flags);\n-\t} else if (ret != -EEXIST && ret != -EINVAL) {\n+\t} else if (ret != -EINVAL) {\n \t\tputs(\"ERROR: reserving fdt memory region failed \");\n \t\tprintf(\"(addr=%llx size=%llx flags=%x)\\n\",\n \t\t (unsigned long long)addr,\n@@ -108,6 +109,8 @@ void boot_fdt_add_mem_rsv_regions(void *fdt_blob)\n \tif (fdt_check_header(fdt_blob) != 0)\n \t\treturn;\n \n+\tlmb_free_fdt_regions();\n+\n \t/* process memreserve sections */\n \ttotal = fdt_num_mem_rsv(fdt_blob);\n \tfor (i = 0; i < total; i++) {\ndiff --git a/include/lmb.h b/include/lmb.h\nindex 5d5f037ccb9..1b59a63f61d 100644\n--- a/include/lmb.h\n+++ b/include/lmb.h\n@@ -25,11 +25,13 @@\n * %LMB_NOMAP: Don't add to MMU configuration\n * %LMB_NOOVERWRITE: The memory region cannot be overwritten/re-reserved\n * %LMB_NONOTIFY: Do not notify other modules of changes to this memory region\n+ * %LMB_FDT: A FDT reserved region that can be reclaimed if the FDT changes\n */\n #define LMB_NONE 0\n #define LMB_NOMAP BIT(1)\n #define LMB_NOOVERWRITE BIT(2)\n #define LMB_NONOTIFY BIT(3)\n+#define LMB_FDT BIT(4)\n \n /**\n * enum lmb_mem_type - type of memory allocation request\n@@ -215,6 +217,11 @@ phys_addr_t io_lmb_alloc(struct lmb *io_lmb, phys_size_t size, ulong align);\n */\n long io_lmb_free(struct lmb *io_lmb, phys_addr_t base, phys_size_t size);\n \n+/**\n+ * lmb_free_fdt_regions() - Reclaim all LMB_FDT tagged reserved regions\n+ */\n+void lmb_free_fdt_regions(void);\n+\n #endif /* __KERNEL__ */\n \n #endif /* _LINUX_LMB_H */\ndiff --git a/lib/lmb.c b/lib/lmb.c\nindex e2d9fe86c14..542bb11dcf5 100644\n--- a/lib/lmb.c\n+++ b/lib/lmb.c\n@@ -669,6 +669,29 @@ long lmb_free(phys_addr_t base, phys_size_t size, u32 flags)\n \treturn lmb_map_update_notify(base, size, LMB_MAP_OP_FREE, flags);\n }\n \n+void lmb_free_fdt_regions(void)\n+{\n+\tstruct alist *lmb_rgn_lst = &lmb.used_mem;\n+\tstruct lmb_region *rgn = lmb_rgn_lst->data;\n+\tlong ret;\n+\n+\tfor (int i = 0; i < lmb_rgn_lst->count; i++) {\n+\t\tphys_addr_t base = rgn[i].base;\n+\t\tphys_size_t size = rgn[i].size;\n+\t\tu32 flags = rgn[i].flags;\n+\n+\t\tif (flags & LMB_FDT) {\n+\t\t\tret = lmb_free(base, size, flags);\n+\t\t\tif (ret < 0) {\n+\t\t\t\tprintf(\"Unable to free FDT memory at 0x%08lx\",\n+\t\t\t\t (ulong)base);\n+\t\t\t\tcontinue;\n+\t\t\t}\n+\t\t\ti--;\n+\t\t}\n+\t}\n+}\n+\n static int _lmb_alloc_base(phys_size_t size, ulong align,\n \t\t\t phys_addr_t *addr, u32 flags)\n {\n","prefixes":["1/6"]}