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Fix a optimization related problem in the LM3S 

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4907 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2012-07-04 22:11:31 +00:00
parent 92e24d894a
commit 8c9d2a06c4
5 changed files with 10 additions and 6 deletions
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4
ChangeLog
View File

@ -2952,4 +2952,8 @@
Xplorer board. This is just to facilitate testing of the LPC43xx
port but will, with any luck, become proper board support for that
board.
* arch/arm/src/lm3s/lm3s_syscontrol.c: Fix an optimization related problem
by adding a volatile qualifier to a timing loop. Oddly, the consequence
of the bug is that when debug was off, the LM3S platform too a long time
to boot. It now boots rapidly whether debug is on or off.

4
arch/arm/src/lm3s/lm3s_syscontrol.c
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@ -110,7 +110,7 @@ static inline void lm3s_oscdelay(uint32_t rcc, uint32_t rcc2)
* current clock rate is very slow.
*/
uint32_t delay = FAST_OSCDELAY;
uint32_t delay = FAST_OSCDELAY;
/* Are we currently using RCC2? */
@ -150,7 +150,7 @@ static inline void lm3s_oscdelay(uint32_t rcc, uint32_t rcc2)
static inline void lm3s_plllock(void)
{
uint32_t delay;
volatile uint32_t delay;
/* Loop until the lock is achieved or until a timeout occurs */

2
configs/ekk-lm3s9b96/README.txt
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@ -268,7 +268,7 @@ Stellaris EKK-LM3S9B96 Evaluation Kit Configuration Options
CONFIG_DRAM_SIZE - Describes the installed DRAM (SRAM in this case):
CONFIG_DRAM_SIZE=0x00010000 (64Kb)
CONFIG_DRAM_SIZE=0x00018000 (96Kb)
CONFIG_DRAM_START - The start address of installed DRAM

2
configs/ekk-lm3s9b96/src/up_boot.c
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@ -72,7 +72,7 @@
void lm3s_boardinitialize(void)
{
/* Configure SPI chip selects if 1) SSI is not disabled, and 2) the weak function
/* Configure chip selects if 1) SSI is not disabled, and 2) the weak function
* lm3s_ssiinitialize() has been brought into the link.
*/

4
configs/ekk-lm3s9b96/src/up_ssi.c
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@ -99,13 +99,13 @@
* Name: lm3s_ssiinitialize
*
* Description:
* Called to configure SPI chip select GPIO pins for the LM3S6965 Eval Kit.
* Called to configure chip select GPIO pins for the LM3S9B96 Eval board.
*
************************************************************************************/
void weak_function lm3s_ssiinitialize(void)
{
/* Configure the SPI CS GPIO */
/* Configure the CS GPIO */
#if 0
ssi_dumpgpio("lm3s_ssiinitialize() Entry");
ssi_dumpgpio("lm3s_ssiinitialize() Exit");