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uboot-mediatek: add command for getting size of ram

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Add command which gets ramsize and write it to env variable.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://github.com/openwrt/openwrt/pull/21437
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Frank Wunderlich 2026-01-17 19:00:56 +01:00 • committed by Hauke Mehrtens
parent 02b2dd3508
commit 46ee5209aa
2 changed files with 121 additions and 0 deletions
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4
package/boot/uboot-mediatek/patches/450-add-bpi-r4.patch
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@ -75,6 +75,7 @@
+CONFIG_CMD_FS_UUID=y
+CONFIG_CMD_UBI=y
+CONFIG_CMD_UBI_RENAME=y
+CONFIG_CMD_MEMSIZE=y
+CONFIG_OF_EMBED=y
+CONFIG_ENV_OVERWRITE=y
+CONFIG_ENV_IS_IN_MMC=y
@ -356,6 +357,7 @@
+CONFIG_CMD_FS_UUID=y
+CONFIG_CMD_UBI=y
+CONFIG_CMD_UBI_RENAME=y
+CONFIG_CMD_MEMSIZE=y
+CONFIG_OF_EMBED=y
+CONFIG_ENV_OVERWRITE=y
+CONFIG_ENV_IS_IN_UBI=y
@ -948,6 +950,7 @@
+CONFIG_CMD_FS_UUID=y
+CONFIG_CMD_UBI=y
+CONFIG_CMD_UBI_RENAME=y
+CONFIG_CMD_MEMSIZE=y
+CONFIG_OF_EMBED=y
+CONFIG_ENV_OVERWRITE=y
+CONFIG_ENV_IS_IN_MMC=y
@ -1229,6 +1232,7 @@
+CONFIG_CMD_FS_UUID=y
+CONFIG_CMD_UBI=y
+CONFIG_CMD_UBI_RENAME=y
+CONFIG_CMD_MEMSIZE=y
+CONFIG_OF_EMBED=y
+CONFIG_ENV_OVERWRITE=y
+CONFIG_ENV_IS_IN_UBI=y

117
package/boot/uboot-mediatek/patches/501-add-cmd-msize.patch Normal file
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@ -0,0 +1,117 @@
From 83c596f12349fdc77fa76e1d017b4fc8882744ef Mon Sep 17 00:00:00 2001
From: Frank Wunderlich <frank-w@public-files.de>
Date: Sat, 17 Jan 2026 12:38:40 +0100
To: Tom Rini <trini@konsulko.com>
Cc: u-boot@lists.denx.de,
Daniel Golle <daniel@makrotopia.org>
Subject: [PATCH v4] cmd: mem: add function for getting ram size for use in
scripts
Add a command for getting detected ram size with possibility to write
to environment variable.
example usage:
BPI-R4> msize
4294967296
BPI-R4> msize m
4096m
BPI-R4> msize g
4g
BPI-R4> msize g ramsize
BPI-R4> printenv ramsize
ramsize=4
BPI-R4>
board with 8GB ram:
BPI-R4> msize
8589934592
BPI-R4> msize m
8192m
BPI-R4> msize g
8g
BPI-R4> msize g ramsize
BPI-R4> printenv ramsize
ramsize=8
BPI-R4>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
v4: drop rounding to full MB/GB as it leads to wrong display
v3: add missing ifdefs
v2: add Kconfig entry
---
cmd/Kconfig | 5 +++++
cmd/mem.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 37 insertions(+)
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -980,6 +980,11 @@ config CMD_RANDOM
help
random - fill memory with random data
+config CMD_MEMSIZE
+ bool "memsize"
+ help
+ Get RAM via command for use in scripts.
+
config CMD_MEMTEST
bool "memtest"
help
--- a/cmd/mem.c
+++ b/cmd/mem.c
@@ -33,6 +33,7 @@
#include <linux/compiler.h>
#include <linux/ctype.h>
#include <linux/delay.h>
+#include <linux/sizes.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -711,6 +712,29 @@ static int do_mem_loopw(struct cmd_tbl *
}
#endif /* CONFIG_LOOPW */
+#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;
+
+ if (argc > 1) {
+ if (!strcmp(argv[1], "m"))
+ memsize = memsize / SZ_1M;
+ else if (!strcmp(argv[1], "g"))
+ memsize = memsize / SZ_1G;
+ if (argc > 2)
+ env_set_ulong(argv[2], memsize);
+ else
+ printf("%lld%s\n", memsize, argv[1]);
+ } else {
+ printf("%lld\n", memsize);
+ }
+
+ return 0;
+}
+#endif /* CONFIG_CMD_MEMSIZE */
+
#ifdef CONFIG_CMD_MEMTEST
static ulong mem_test_alt(volatile ulong *buf, ulong start_addr, ulong end_addr,
volatile ulong *dummy)
@@ -1404,6 +1428,14 @@ U_BOOT_CMD(
);
#endif /* CONFIG_LOOPW */
+#ifdef CONFIG_CMD_MEMSIZE
+U_BOOT_CMD(
+ msize, 3, 1, do_mem_size,
+ "get detected ram size, optional set env variable with value",
+ "[m, g] [envvar]"
+);
+#endif /* CONFIG_CMD_MEMSIZE */
+
#ifdef CONFIG_CMD_MEMTEST
U_BOOT_CMD(
mtest, 5, 1, do_mem_mtest,