[U-Boot] [PATCH v2 07/10] Add option to display customised memory information

[Simon Glass]

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 at chromium.org>
---
Changes in v2:
- Rewrite customised memory info patch to use a command

 README                   |    1 +
 common/cmd_mem.c         |   27 +++++++++++++++++++++++++++
 include/common.h         |    9 +++++++++
 include/config_cmd_all.h |    1 +
 4 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/README b/README
index 36853e5..200edf8 100644
--- a/README
+++ b/README
@@ -840,6 +840,7 @@ The following options need to be configured:
 		CONFIG_CMD_LOADS	  loads
 		CONFIG_CMD_MD5SUM	  print md5 message digest
 					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
+		CONFIG_CMD_MEMINFO	* Display detailed memory information
 		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
 					  loop, loopw, mtest
 		CONFIG_CMD_MISC		  Misc functions like sleep etc
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
diff --git a/include/common.h b/include/common.h
index 5e3c5ee..a1ab4f0 100644
--- a/include/common.h
+++ b/include/common.h
@@ -311,6 +311,15 @@ int mac_read_from_eeprom(void);
 extern u8 _binary_dt_dtb_start[];	/* embedded device tree blob */
 int set_cpu_clk_info(void);
 
+/**
+ * Show the DRAM size in a board-specific way
+ *
+ * This is used by boards to display DRAM information in their own way.
+ *
+ * @param size	Size of DRAM (which should be displayed along with other info)
+ */
+void board_show_dram(ulong size);
+
 /* common/flash.c */
 void flash_perror (int);
 
diff --git a/include/config_cmd_all.h b/include/config_cmd_all.h
index f434cd0..eadc8b7 100644
--- a/include/config_cmd_all.h
+++ b/include/config_cmd_all.h
@@ -53,6 +53,7 @@
 #define CONFIG_CMD_LICENSE	/* console license display	*/
 #define CONFIG_CMD_LOADB	/* loadb			*/
 #define CONFIG_CMD_LOADS	/* loads			*/
+#define CONFIG_CMD_MEMINFO	/* meminfo			*/
 #define CONFIG_CMD_MEMORY	/* md mm nm mw cp cmp crc base loop mtest */
 #define CONFIG_CMD_MFSL		/* FSL support for Microblaze	*/
 #define CONFIG_CMD_MII		/* MII support			*/
-- 
1.7.7.3