diff options
Diffstat (limited to 'commands/mw.c')
| -rw-r--r-- | commands/mw.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/commands/mw.c b/commands/mw.c index 5bd4bdd58f..915f549216 100644 --- a/commands/mw.c +++ b/commands/mw.c @@ -39,8 +39,10 @@ static int do_mem_mw(int argc, char *argv[]) adr = strtoull_suffix(argv[optind++], NULL, 0); fd = open_and_lseek(filename, mode | O_WRONLY | O_CREAT, adr); - if (fd < 0) + if (fd < 0) { + printf("Could not open \"%s\": %m\n", filename); return 1; + } while (optind < argc) { u8 val8; @@ -110,12 +112,17 @@ BAREBOX_CMD_HELP_OPT ("-l", "long access (32 bit)") BAREBOX_CMD_HELP_OPT ("-q", "quad access (64 bit)") BAREBOX_CMD_HELP_OPT ("-d FILE", "write file (default /dev/mem)") BAREBOX_CMD_HELP_OPT ("-x", "swap bytes") +BAREBOX_CMD_HELP_TEXT("") +BAREBOX_CMD_HELP_TEXT("Memory regions can be specified in two different forms: START+SIZE") +BAREBOX_CMD_HELP_TEXT("or START-END, If START is omitted it defaults to 0x100") +BAREBOX_CMD_HELP_TEXT("Sizes can be specified as decimal, or if prefixed with 0x as hexadecimal.") +BAREBOX_CMD_HELP_TEXT("An optional suffix of k, M or G is for kbytes, Megabytes or Gigabytes.") BAREBOX_CMD_HELP_END BAREBOX_CMD_START(mw) .cmd = do_mem_mw, BAREBOX_CMD_DESC("memory write") - BAREBOX_CMD_OPTS("[-bwldx] REGION DATA...") + BAREBOX_CMD_OPTS("[-bwlqx] [-d FILE] REGION DATA...") BAREBOX_CMD_GROUP(CMD_GRP_MEM) BAREBOX_CMD_HELP(cmd_mw_help) BAREBOX_CMD_END |