Redboot load command is crippled

[John Clark <clarkjc@runbox.com>]

Hello,

I've noticed that the Redboot load command is crippled whenever 
"Validate RAM addresses during load" 
(CYGSEM_REDBOOT_VALIDATE_USER_RAM_LOADS) is disabled.  It looks like 
when the load into flash option was added to load.c, a call to 
valid_address() was added to load_elf_image() and load_srec_image() to 
determine whether to write to flash or not.

I'm new to using Redboot and eCos.  I've been playing with it on an i386 
PC target and loading eCos applications into extended memory above 1 
MB.  Redboot seems to require address validation to be disabled because 
this platform doesn't implement cyg_plf_memory_segment().

Anyhow, because of the unconditional calls to valid_address() now, load 
reports success but fails to actually write to memory outside of its 
known range.  For a quick fix, I put a check for 
CYGSEM_REDBOOT_VALIDATE_USER_RAM_LOADS around the calls to 
valid_address().  Unfortunately, that breaks the load into flash feature 
completely when address validation is disabled.

Everything else looks great.  I'm really starting to like eCos.  Thanks.

- John