Merge patch series "Add command for getting ramsize in scripts"

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

Add command for getting ramsize in scripts

Link: https://lore.kernel.org/r/20260204184045.111808-1-linux@fw-web.de

cmd/Kconfig

@@ -940,6 +940,14 @@ config CMD_MEMINFO_MAP
 
 	  See doc/usage/cmd/meminfo.rst for more information.
 
+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
+	  in MiB to environment variable.
+
 config CMD_MEMORY
 	bool "md, mm, nm, mw, cp, cmp, base, loop"
 	default y

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 */

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.

test/cmd/meminfo.c

@@ -7,6 +7,7 @@
  */
 
 #include <dm/test.h>
+#include <env.h>
 #include <test/cmd.h>
 #include <test/ut.h>
 
@@ -49,4 +50,23 @@ 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