Commit a42f85fe authored by oharboe's avatar oharboe
Browse files

documentation wip for upcoming patch.

git-svn-id: svn://svn.berlios.de/openocd/trunk@918 b42882b7-edfa-0310-969c-e2dbd0fdcd60
parent 8858bf41
......@@ -12,6 +12,7 @@
@copying
Copyright @copyright{} 2007-2008 Spen @email{spen@@spen-soft.co.uk}
Copyright @copyright{} 2008 Oyvind Harboe @email{oyvind.harboe@@zylin.com}
@quotation
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2 or
......@@ -1054,15 +1055,6 @@ The target is resumed in the currently set @option{core_mode}.
These commands are specific to ARM7 and ARM9 targets, like ARM7TDMI, ARM720t,
ARM920t or ARM926EJ-S.
@itemize @bullet
@item @b{arm7_9 sw_bkpts} <@var{enable}|@var{disable}>
@cindex arm7_9 sw_bkpts
Enable/disable use of software breakpoints. On ARMv4 systems, this reserves
one of the watchpoint registers to implement software breakpoints. Disabling
SW Bkpts frees that register again.
@item @b{arm7_9 force_hw_bkpts} <@var{enable}|@var{disable}>
@cindex arm7_9 force_hw_bkpts
When @option{force_hw_bkpts} is enabled, the @option{sw_bkpts} support is disabled, and all
breakpoints are turned into hardware breakpoints.
@item @b{arm7_9 dbgrq} <@var{enable}|@var{disable}>
@cindex arm7_9 dbgrq
Enable use of the DBGRQ bit to force entry into debug mode. This should be
......@@ -1314,7 +1306,7 @@ working area.
Informing gdb of the memory map of the target will enable gdb to protect any
flash area of the target and use hardware breakpoints by default. This means
that the OpenOCD option @option{arm7_9 force_hw_bkpts} is not required when
that the OpenOCD option @option{gdb_breakpoint_override} is not required when
using a memory map.
To view the configured memory map in gdb, use the gdb command @option{info mem}
......@@ -1455,6 +1447,14 @@ use @option{flash write_image} command passing @option{erase} as the first param
this config option has been removed, simply adding @option{init} and @option{reset halt} to
the end of your config script will give the same behaviour as using @option{daemon_startup reset}
and @option{target cortex_m3 little reset_halt 0}.
@item @b{arm7_9 sw_bkpts}
@cindex arm7_9 sw_bkpts
On by default. See also @option{gdb_breakpoint_override}.
@item @b{arm7_9 force_hw_bkpts}
@cindex arm7_9 force_hw_bkpts
Use @option{gdb_breakpoint_override} instead. Note that GDB will use hardware breakpoints
for flash if the gdb memory map has been set up(default when flash is declared in
target configuration).
@item @b{run_and_halt_time}
@cindex run_and_halt_time
This command has been removed for simpler reset behaviour, it can be simulated with the
......@@ -1482,11 +1482,7 @@ arm7_9_add_breakpoint(): sw breakpoint requested, but software breakpoints not e
GDB issues software breakpoints when a normal breakpoint is requested, or to implement
source-line single-stepping. On ARMv4T systems, like ARM7TDMI, ARM720t or ARM920t,
software breakpoints consume one of the two available hardware breakpoints,
and are therefore disabled by default. If your code is running from RAM, you
can enable software breakpoints with the @option{arm7_9 sw_bkpts enable} command. If
your code resides in Flash, you can't use software breakpoints, but you can force
OpenOCD to use hardware breakpoints instead: @option{arm7_9 force_hw_bkpts enable}.
software breakpoints consume one of the two available hardware breakpoints.
@item When erasing or writing LPC2000 on-chip flash, the operation fails sometimes
and works sometimes fine.
......
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