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GET /api/1.1/patches/2223798/?format=api
{ "id": 2223798, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2223798/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/patch/20260416084535.1490476-2-ghidoliemanuele@gmail.com/", "project": { "id": 18, "url": "http://patchwork.ozlabs.org/api/1.1/projects/18/?format=api", "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": "<20260416084535.1490476-2-ghidoliemanuele@gmail.com>", "date": "2026-04-16T08:45:23", "name": "[v1,1/3] common: memsize: add RAM size probe based on alias detection", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "60cb3a85c5511179514bfd7ac3017c3442d5f4ad", "submitter": { "id": 85913, "url": "http://patchwork.ozlabs.org/api/1.1/people/85913/?format=api", "name": "Emanuele Ghidoli", "email": "ghidoliemanuele@gmail.com" }, "delegate": { "id": 151988, "url": "http://patchwork.ozlabs.org/api/1.1/users/151988/?format=api", "username": "festevam", "first_name": "Fabio", "last_name": "Estevam", "email": "festevam@gmail.com" }, "mbox": "http://patchwork.ozlabs.org/project/uboot/patch/20260416084535.1490476-2-ghidoliemanuele@gmail.com/mbox/", "series": [ { "id": 500111, "url": "http://patchwork.ozlabs.org/api/1.1/series/500111/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/list/?series=500111", "date": "2026-04-16T08:45:22", "name": "add Toradex Verdin iMX95 support", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500111/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2223798/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223798/checks/", "tags": {}, "headers": { "Return-Path": "<u-boot-bounces@lists.denx.de>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=mhOL4pS0;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=85.214.62.61; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)", "phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com", "phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de", "phobos.denx.de;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.b=\"mhOL4pS0\";\n\tdkim-atps=neutral", "phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com", "phobos.denx.de;\n spf=pass smtp.mailfrom=ghidoliemanuele@gmail.com" ], "Received": [ "from phobos.denx.de (phobos.denx.de [85.214.62.61])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fxBTz4ZHgz1yDF\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 16 Apr 2026 18:47:35 +1000 (AEST)", "from h2850616.stratoserver.net (localhost [IPv6:::1])\n\tby phobos.denx.de (Postfix) with ESMTP id 2D9FE840AB;\n\tThu, 16 Apr 2026 10:47:28 +0200 (CEST)", "by phobos.denx.de (Postfix, from userid 109)\n id 53CDC84105; Thu, 16 Apr 2026 10:47:24 +0200 (CEST)", "from mail-wm1-x335.google.com (mail-wm1-x335.google.com\n [IPv6:2a00:1450:4864:20::335])\n (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits))\n (No client certificate requested)\n by phobos.denx.de (Postfix) with ESMTPS id 552DF84105\n for <u-boot@lists.denx.de>; Thu, 16 Apr 2026 10:47:22 +0200 (CEST)", "by mail-wm1-x335.google.com with SMTP id\n 5b1f17b1804b1-488b3f8fa2bso3718615e9.1\n for <u-boot@lists.denx.de>; Thu, 16 Apr 2026 01:47:22 -0700 (PDT)", "from emanueleg-nb.homenet.telecomitalia.it\n (host-87-2-163-213.retail.telecomitalia.it. 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Experimentally, the observed\npattern is:\n\nWrite Read\ny00000000 -> x0001c000\ny00004000 -> x00018000\ny00008000 -> x00014000\ny0000c000 -> x00010000\ny00010000 -> x0000c000\ny00014000 -> x00008000\ny00018000 -> x00004000\ny0001c000 -> x00000000\n\nThis helper makes it possible to probe RAM size by explicitly specifying\nthe probed address and the expected alias address for each size check.\n\nSigned-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>\n---\n common/memsize.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++\n include/init.h | 7 ++++++\n 2 files changed, 63 insertions(+)", "diff": "diff --git a/common/memsize.c b/common/memsize.c\nindex 1abf3fc47d73..cf46a6b17872 100644\n--- a/common/memsize.c\n+++ b/common/memsize.c\n@@ -127,6 +127,62 @@ long get_ram_size(long *base, long maxsize)\n \treturn (maxsize);\n }\n \n+/**\n+ * probe_ram_size_by_alias() - Detect RAM size using known alias addresses\n+ * @checks: Array of RAM alias probe descriptors, terminated by a NULL\n+ *\t @probe_addr entry\n+ *\n+ * Probe RAM size by writing a test pattern to each @probe_addr and checking\n+ * whether the same pattern does not appear at the corresponding @alias_addr.\n+ * This is useful on systems where address wrap-around does not alias to the\n+ * base of memory in a linear way, so get_ram_size() cannot be used directly.\n+ * It is also useful on systems where the base of the physical memory cannot\n+ * be safely accessed, so get_ram_size() cannot be used at all.\n+ *\n+ * Return: The size associated with the first matching entry, or 0 if no match\n+ * is found.\n+ */\n+long probe_ram_size_by_alias(const struct ram_alias_check *checks)\n+{\n+\tlong save[2];\n+\tint dcache_en = dcache_status();\n+\tlong ret = 0;\n+\n+\twhile (checks->probe_addr && !ret) {\n+\t\tvolatile long *d = checks->probe_addr;\n+\t\tvolatile long *s = checks->alias_addr;\n+\n+\t\tsave[0] = *s;\n+\t\tsave[1] = *d;\n+\t\t/* Ensure s is written and not cached */\n+\t\tif (dcache_en)\n+\t\t\tdcache_flush_invalidate(s);\n+\n+\t\t*d = ~save[0];\n+\t\tsync();\n+\t\tif (dcache_en)\n+\t\t\tdcache_flush_invalidate(d);\n+\n+\t\tif (*s != ~save[0])\n+\t\t\tret = checks->size;\n+\n+\t\t/* Restore content */\n+\t\t*d = save[1];\n+\t\tsync();\n+\t\tif (dcache_en)\n+\t\t\tdcache_flush_invalidate(d);\n+\n+\t\t*s = save[0];\n+\t\tsync();\n+\t\tif (dcache_en)\n+\t\t\tdcache_flush_invalidate(s);\n+\n+\t\tchecks++;\n+\t}\n+\n+\treturn ret;\n+}\n+\n phys_size_t __weak get_effective_memsize(void)\n {\n \tphys_size_t ram_size = gd->ram_size;\ndiff --git a/include/init.h b/include/init.h\nindex 1e375da48936..c31ebd83b85e 100644\n--- a/include/init.h\n+++ b/include/init.h\n@@ -14,6 +14,12 @@\n \n #include <linux/types.h>\n \n+struct ram_alias_check {\n+\tvoid *probe_addr;\n+\tvoid *alias_addr;\n+\tlong size;\n+};\n+\n /*\n * In case of the EFI app the UEFI firmware provides the low-level\n * initialisation.\n@@ -88,6 +94,7 @@ int dram_init(void);\n int dram_init_banksize(void);\n \n long get_ram_size(long *base, long size);\n+long probe_ram_size_by_alias(const struct ram_alias_check *checks);\n phys_size_t get_effective_memsize(void);\n \n int testdram(void);\n", "prefixes": [ "v1", "1/3" ] }