[PATCH v7 0/3] Add command for getting ramsize in scripts

[PATCH v7 0/3] Add command for getting ramsize in scripts

[Frank Wunderlich]

From: Frank Wunderlich <frank-w@public-files.de>

Add command for getting ramsize in scripts

v7:
- add guard for test to not fail for x86_64 qemu board
- extend doc and config help text
v6:
- add missing return for error in env_set_long
v5:
- move msize to meminfo and drop first param (always display as MiB)
- rename msize to memsize
- add doc and test so it becomes a series

Frank Wunderlich (3):
  cmd: mem: add command for getting ram size for use in scripts
  test: cmd: add test for memsize
  doc: cmd: add usage doc for memsize

 cmd/Kconfig               |  8 ++++++++
 cmd/meminfo.c             | 25 +++++++++++++++++++++++
 doc/usage/cmd/memsize.rst | 43 +++++++++++++++++++++++++++++++++++++++
 test/cmd/meminfo.c        | 20 ++++++++++++++++++
 4 files changed, 96 insertions(+)
 create mode 100644 doc/usage/cmd/memsize.rst

-- 
2.43.0

[PATCH v7 1/3] cmd: mem: add command for getting ram size for use in scripts

[Frank Wunderlich]

From: Frank Wunderlich <frank-w@public-files.de>

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>
---
v7: add more information to help text in Kconfig
v6: add missing return for error in env_set_ulong
v5: move msize to meminfo and drop first param (always display as MiB)
    rename msize to memsize
v4: drop rounding to full MB/GB as it leads to wrong display
v3: add missing ifdefs
v2: add Kconfig entry
---
 cmd/Kconfig   |  7 +++++++
 cmd/meminfo.c | 25 +++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 5c611fb3016e..2717cbad5f1e 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -925,6 +925,13 @@ 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 aa3b5bafe176..e7db9d065f5a 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 */
-- 
2.43.0

[PATCH v7 2/3] test: cmd: add test for memsize

[Frank Wunderlich]

From: Frank Wunderlich <frank-w@public-files.de>

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

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
v7: guard test with config option

tested via:
$ ./u-boot -T -c "ut cmd cmd_test_memsize"
...
Test: memsize: meminfo.c
Tests run: 1, 0 ms, average: 0 ms, failures: 0
---
 cmd/Kconfig        |  1 +
 test/cmd/meminfo.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 2717cbad5f1e..f16397238b3e 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -927,6 +927,7 @@ 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 53b41e3b49e0..a199c1dc3c74 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
-- 
2.43.0

[PATCH v7 3/3] doc: cmd: add usage doc for memsize

[Frank Wunderlich]

From: Frank Wunderlich <frank-w@public-files.de>

Add documentation for memsize command.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
v7:
- update documentation including decimal notation
---
 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 000000000000..6e99d7c1d33f
--- /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.
-- 
2.43.0

Re: [PATCH v7 0/3] Add command for getting ramsize in scripts

[Tom Rini]

On Wed, 04 Feb 2026 19:40:41 +0100, Frank Wunderlich wrote:

> From: Frank Wunderlich <frank-w@public-files.de>
> 
> Add command for getting ramsize in scripts
> 
> v7:
> - add guard for test to not fail for x86_64 qemu board
> - extend doc and config help text
> v6:
> - add missing return for error in env_set_long
> v5:
> - move msize to meminfo and drop first param (always display as MiB)
> - rename msize to memsize
> - add doc and test so it becomes a series
> 
> [...]

Applied to u-boot/master, thanks!

[1/3] cmd: mem: add command for getting ram size for use in scripts
      commit: e202eca183b0f1d6747b934482dc6249abdd742b
[2/3] test: cmd: add test for memsize
      commit: 8acc8a654643ca26b0bdd4af37010da7cc796753
[3/3] doc: cmd: add usage doc for memsize
      commit: b4842032d542cfde271aab61b80ab870b27b07b2
-- 
Tom