Add option to display customised memory information

Some boards want to report more than just memory size. For example, it
might be useful to display the memory type (DDR2, DDR3) or manufacturer.

Add a weak function to support this requirement, accessed through a new
'meminfo' command.

Any example of the DRAM: output is below, just for illustration:

SMDK5250 # meminfo
DRAM:  2 GiB Elpida DDR3 @ 800MHz

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/common/cmd_mem.c b/common/cmd_mem.c
index 4d64cff..0f3ffc8 100644
--- a/common/cmd_mem.c
+++ b/common/cmd_mem.c
@@ -33,6 +33,9 @@
 #include <dataflash.h>
 #endif
 #include <watchdog.h>
+#include <linux/compiler.h>
+
+DECLARE_GLOBAL_DATA_PTR;
 
 static int mod_mem(cmd_tbl_t *, int, int, int, char * const []);
 
@@ -1203,6 +1206,22 @@ U_BOOT_CMD(
 
 #endif
 
+#ifdef CONFIG_CMD_MEMINFO
+__weak void board_show_dram(ulong size)
+{
+	puts("DRAM:  ");
+	print_size(size, "\n");
+}
+
+static int do_mem_info(cmd_tbl_t *cmdtp, int flag, int argc,
+		       char * const argv[])
+{
+	board_show_dram(gd->ram_size);
+
+	return 0;
+}
+#endif
+
 U_BOOT_CMD(
 	base,	2,	1,	do_mem_base,
 	"print or set address offset",
@@ -1243,3 +1262,11 @@ U_BOOT_CMD(
 	"[.b, .w, .l] address value delay(ms)"
 );
 #endif /* CONFIG_MX_CYCLIC */
+
+#ifdef CONFIG_CMD_MEMINFO
+U_BOOT_CMD(
+	meminfo,	3,	1,	do_mem_info,
+	"display memory information",
+	""
+);
+#endif