[U-Boot] [PATCH v2] cmd: mem: Add a command to fill the memory with random data

[Tom Rini]

On Tue, Jul 02, 2019 at 10:50:43AM +0200, Jean-Jacques Hiblot wrote:
> +Tom
> 
> On 02/07/2019 10:36, Jean-Jacques Hiblot wrote:
> >This command fills the memory with data produced by rand().
> >This command depends on CONFIG_LIB_RAND.
> >
> >Signed-off-by: Jean-Jacques Hiblot <jjhiblot at ti.com>
> >---
> >changes in v2:
> >- Do not include the command if CONFIG_LIB_RAND is not set
> >- make do_random() static
> >
> >cmd/Kconfig |  3 ++-
> >  cmd/mem.c   | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 54 insertions(+), 1 deletion(-)
> >
> >diff --git a/cmd/Kconfig b/cmd/Kconfig
> >index cda7931fe3..f9385fcc08 100644
> >--- a/cmd/Kconfig
> >+++ b/cmd/Kconfig
> >@@ -537,7 +537,7 @@ 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.
> >@@ -549,6 +549,7 @@ 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..e5af12db57 100644
> >--- a/cmd/mem.c
> >+++ b/cmd/mem.c
> >@@ -1082,6 +1082,49 @@ static int do_mem_crc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> >  #endif
> >+#ifdef CONFIG_LIB_RAND
> >+static 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;
> >+}
> >+#endif
> >+
> >  /**************************************************/
> >  U_BOOT_CMD(
> >  	md,	3,	1,	do_mem_md,
> >@@ -1250,3 +1293,12 @@ U_BOOT_CMD(
> >  	""
> >  );
> >  #endif
> >+
> >+#ifdef CONFIG_LIB_RAND
> >+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"
> >+);
> >+#endif

This needs to be a new CONFIG option that depends on CMD_MEM, thanks!

-- 
Tom
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