eCos(Samsung SNDS based) on BLR-TX4L(S3C4510X)
http://freewing-web.hp.infoseek.co.jp/arm_gcc/

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RedBoot(tm) bootstrap and debug environment [ROM]
Non-certified release, version v2_0 - built 18:18:36, Dec 18 2003

Platform: Samsung SNDS (ARM 7TDMI)
Copyright (C) 2000, 2001, 2002, Red Hat, Inc.

RAM: 0x00000000-0x00800000, 0x00024350-0x00800000 available
RedBoot> help
Manage machine caches
   cache [ON | OFF]
Display/switch console channel
   channel [-1|<channel number>]
Compute a 32bit checksum [POSIX algorithm] for a range of memory
   cksum -b <location> -l <length>
Display (hex dump) a range of memory
   dump -b <location> [-l <length>] [-s] [-1|2|4]
Execute code at a location
   go [-w <timeout>] [entry]
Help about help?
   help [<topic>]
Load a file
   load [-r] [-v] [-h <host>] [-m <varies>] [-c <channel_number>]
        [-b <base_address>] <file_name>
Compare two blocks of memory
   mcmp -s <location> -d <location> -l <length> [-1|-2|-4]
Fill a block of memory with a pattern
   mfill -b <location> -l <length> -p <pattern> [-1|-2|-4]
Reset the system
   reset
Display RedBoot version information
   version
Display (hex dump) a range of memory
   x -b <location> [-l <length>] [-s] [-1|2|4]
RedBoot>