[U-Boot] [PATCH] cmd: mem: Add a command to fill the memory with random data

[Jean-Jacques Hiblot]

This command fills the memory with data produced by rand().

Signed-off-by: Jean-Jacques Hiblot <jjhib...@ti.com>
---
 cmd/Kconfig |  3 ++-
 cmd/mem.c   | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index ea1a325eb3..ff96ac5d14 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -517,7 +517,7 @@ config CMD_MEMINFO
          Display memory information.
 
 config CMD_MEMORY
-       bool "md, mm, nm, mw, cp, cmp, base, loop"
+       bool "md, mm, nm, mw, cp, cmp, base, loop, random"
        default y
        help
          Memory commands.
@@ -529,6 +529,7 @@ config CMD_MEMORY
            cmp - memory compare
            base - print or set address offset
            loop - initialize loop on address range
+           random - fill memory with random data
 
 config CMD_MEMTEST
        bool "memtest"
diff --git a/cmd/mem.c b/cmd/mem.c
index 392ed1756b..54e65be347 100644
--- a/cmd/mem.c
+++ b/cmd/mem.c
@@ -1082,6 +1082,47 @@ static int do_mem_crc(cmd_tbl_t *cmdtp, int flag, int 
argc, char * const argv[])
 
 #endif
 
+int do_random(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+       unsigned long addr, len;
+       unsigned long seed; // NOT INITIALIZED ON PURPOSE
+       unsigned int *buf, *start;
+       unsigned char *buf8;
+       unsigned int i;
+
+       if (argc < 3 || argc > 4) {
+               printf("usage: %s <addr> <len> [<seed>]\n", argv[0]);
+               return 0;
+       }
+
+       len = simple_strtoul(argv[2], NULL, 16);
+       addr = simple_strtoul(argv[1], NULL, 16);
+
+       if (argc == 4) {
+               seed = simple_strtoul(argv[3], NULL, 16);
+               if (seed == 0) {
+                       printf("The seed cannot be 0. Using 0xDEADBEEF.\n");
+                       seed = 0xDEADBEEF;
+               }
+       } else {
+               seed = get_timer(0) ^ rand();
+       }
+
+       srand(seed);
+       start = map_sysmem(addr, len);
+       buf = start;
+       for (i = 0; i < (len / 4); i++)
+               *buf++ = rand();
+
+       buf8 = (unsigned char *)buf;
+       for (i = 0; i < (len % 4); i++)
+               *buf8++ = rand() & 0xFF;
+
+       unmap_sysmem(start);
+       printf("%lu bytes filled with random data\n", len);
+       return 1;
+}
+
 /**************************************************/
 U_BOOT_CMD(
        md,     3,      1,      do_mem_md,
@@ -1250,3 +1291,10 @@ U_BOOT_CMD(
        ""
 );
 #endif
+
+U_BOOT_CMD(
+       random, 4,      0,      do_random,
+       "fill memory with random pattern",
+       "<addr> <len> [<seed>]\n"
+       "   - Fill 'len' bytes of memory starting at 'addr' with random data\n"
+);
-- 
2.17.1

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