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Redboot load command is crippled
- From: John Clark <clarkjc at runbox dot com>
- To: ecos-devel at sourceware dot org
- Cc: asl at sourceware dot org
- Date: Sun, 19 Nov 2006 07:45:54 -0500
- Subject: Redboot load command is crippled
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