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arm11 burst writes are now only enabled for writes larger than 1 word. Single word writes are frequently used from reset init scripts to non-memory peripherals.

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This commit is contained in:
Øyvind Harboe 2009-10-12 15:13:44 +02:00
parent 407061eaa6
commit 23c629a85e
2 changed files with 16 additions and 3 deletions
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6
doc/openocd.texi
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@ -5737,7 +5737,11 @@ one bit in the encoding, effecively a fifth parameter.)
@deffn Command {arm11 memwrite burst} [value]
Displays the value of the memwrite burst-enable flag,
which is enabled by default.
which is enabled by default. Burst writes are only used
for memory writes larger than 1 word. Single word writes
are likely to be from reset init scripts and those writes
are often to non-memory locations which could easily have
many wait states, which could easily break burst writes.
If @var{value} is defined, first assigns that.
@end deffn

13
src/target/arm11.c
View File

@ -1408,6 +1408,15 @@ int arm11_write_memory_inner(struct target_s *target, uint32_t address, uint32_t
if (retval != ERROR_OK)
return retval;
/* burst writes are not used for single words as those may well be
* reset init script writes.
*
* The other advantage is that as burst writes are default, we'll
* now exercise both burst and non-burst code paths with the
* default settings, increasing code coverage.
*/
bool burst = arm11_config_memwrite_burst && (count > 1);
switch (size)
{
case 1:
@ -1463,7 +1472,7 @@ int arm11_write_memory_inner(struct target_s *target, uint32_t address, uint32_t
/** \todo TODO: buffer cast to uint32_t* causes alignment warnings */
uint32_t *words = (uint32_t*)buffer;
if (!arm11_config_memwrite_burst)
if (!burst)
{
/* STC p14,c5,[R0],#4 */
/* STC p14,c5,[R0]*/
@ -1501,7 +1510,7 @@ int arm11_write_memory_inner(struct target_s *target, uint32_t address, uint32_t
(unsigned) (address + size * count),
(unsigned) r0);
if (arm11_config_memwrite_burst)
if (burst)
LOG_ERROR("use 'arm11 memwrite burst disable' to disable fast burst mode");
if (arm11_config_memwrite_error_fatal)