From e202eca183b0f1d6747b934482dc6249abdd742b Mon Sep 17 00:00:00 2001
From: Frank Wunderlich <frank-w@public-files.de>
Date: Wed, 4 Feb 2026 19:40:42 +0100
Subject: [PATCH 1/3] cmd: mem: add command for getting ram size for use in
 scripts

Add a command for getting detected ram size with possibility to
assign it to an environment variable.

example usage:

BPI-R4> memsize
4096 MiB
BPI-R4> memsize memsz
BPI-R4> printenv memsz
memsz=4096
BPI-R4>

board with 8GB ram:

BPI-R4> memsize
8192 MiB
BPI-R4> memsize memsz
BPI-R4> printenv memsz
memsz=8192
BPI-R4>

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
 cmd/Kconfig   |  7 +++++++
 cmd/meminfo.c | 25 +++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 595ac49da41..f12fcf6631e 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -940,6 +940,13 @@ config CMD_MEMINFO_MAP
 
 	  See doc/usage/cmd/meminfo.rst for more information.
 
+config CMD_MEMSIZE
+	bool "memsize"
+	depends on CMD_MEMINFO
+	help
+	  Get RAM via command for use in scripts. Print or assign decimal value
+	  in MiB to environment variable.
+
 config CMD_MEMORY
 	bool "md, mm, nm, mw, cp, cmp, base, loop"
 	default y
diff --git a/cmd/meminfo.c b/cmd/meminfo.c
index aa3b5bafe17..e7db9d065f5 100644
--- a/cmd/meminfo.c
+++ b/cmd/meminfo.c
@@ -8,10 +8,12 @@
 #include <bootstage.h>
 #include <command.h>
 #include <display_options.h>
+#include <env.h>
 #include <lmb.h>
 #include <malloc.h>
 #include <mapmem.h>
 #include <asm/global_data.h>
+#include <linux/sizes.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -98,8 +100,31 @@ static int do_meminfo(struct cmd_tbl *cmdtp, int flag, int argc,
 	return 0;
 }
 
+#ifdef CONFIG_CMD_MEMSIZE
+static int do_mem_size(struct cmd_tbl *cmdtp, int flag, int argc,
+		       char *const argv[])
+{
+	u64 memsize = gd->ram_size / SZ_1M;
+
+	if (argc > 1)
+		return env_set_ulong(argv[1], memsize);
+	else
+		printf("%lld MiB\n", memsize);
+
+	return 0;
+}
+#endif /* CONFIG_CMD_MEMSIZE */
+
 U_BOOT_CMD(
 	meminfo,	1,	1,	do_meminfo,
 	"display memory information",
 	""
 );
+
+#ifdef CONFIG_CMD_MEMSIZE
+U_BOOT_CMD(
+	memsize,	2,	1,	do_mem_size,
+	"get detected ram size in MiB, optional set env variable with value",
+	"[envvar]"
+);
+#endif /* CONFIG_CMD_MEMSIZE */

From 8acc8a654643ca26b0bdd4af37010da7cc796753 Mon Sep 17 00:00:00 2001
From: Frank Wunderlich <frank-w@public-files.de>
Date: Wed, 4 Feb 2026 19:40:43 +0100
Subject: [PATCH 2/3] test: cmd: add test for memsize

Add a test for memsize command in same way as meminfo.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
 cmd/Kconfig        |  1 +
 test/cmd/meminfo.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index f12fcf6631e..8bdd04f348f 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -942,6 +942,7 @@ config CMD_MEMINFO_MAP
 
 config CMD_MEMSIZE
 	bool "memsize"
+	default y if SANDBOX
 	depends on CMD_MEMINFO
 	help
 	  Get RAM via command for use in scripts. Print or assign decimal value
diff --git a/test/cmd/meminfo.c b/test/cmd/meminfo.c
index 40c3520496e..af2c19fa67d 100644
--- a/test/cmd/meminfo.c
+++ b/test/cmd/meminfo.c
@@ -7,6 +7,7 @@
  */
 
 #include <dm/test.h>
+#include <env.h>
 #include <test/cmd.h>
 #include <test/ut.h>
 
@@ -39,4 +40,23 @@ static int cmd_test_meminfo(struct unit_test_state *uts)
 
 	return 0;
 }
+
 CMD_TEST(cmd_test_meminfo, UTF_CONSOLE);
+
+/* Test 'memsize' command */
+#ifdef CONFIG_CMD_MEMSIZE
+static int cmd_test_memsize(struct unit_test_state *uts)
+{
+	ut_assertok(run_command("memsize", 0));
+	ut_assert_nextline("256 MiB");
+	ut_assert_console_end();
+
+	ut_assertok(run_command("memsize memsz", 0));
+	ut_asserteq_str("256", env_get("memsz"));
+	ut_assert_console_end();
+
+	return 0;
+}
+
+CMD_TEST(cmd_test_memsize, UTF_CONSOLE);
+#endif

From b4842032d542cfde271aab61b80ab870b27b07b2 Mon Sep 17 00:00:00 2001
From: Frank Wunderlich <frank-w@public-files.de>
Date: Wed, 4 Feb 2026 19:40:44 +0100
Subject: [PATCH 3/3] doc: cmd: add usage doc for memsize

Add documentation for memsize command.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
 doc/usage/cmd/memsize.rst | 43 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 doc/usage/cmd/memsize.rst

diff --git a/doc/usage/cmd/memsize.rst b/doc/usage/cmd/memsize.rst
new file mode 100644
index 00000000000..6e99d7c1d33
--- /dev/null
+++ b/doc/usage/cmd/memsize.rst
@@ -0,0 +1,43 @@
+.. SPDX-License-Identifier: GPL-2.0+:
+
+.. index::
+   single: memsize (command)
+
+memsize command
+===============
+
+Synopsis
+--------
+
+::
+
+    memsize [name]
+
+Description
+-----------
+
+The memsize command shows the amount of RAM in MiB in decimal notation.
+Optionally same value can be assigned to an environment variable.
+
+Examples
+--------
+
+This first example shows printing of ram size:
+
+::
+
+  => memsize
+  8192 MiB
+
+This second example shows assign ram size to environment variable:
+
+::
+
+  => memsize memsz
+  => printenv memsz
+  memsz=8192
+
+Return value
+------------
+
+The return value is always 0 except error happens on setting environment variable.