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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2472 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2009-12-31 20:39:23 +00:00
parent 84f8d892a9
commit 6078277d40
1 changed files with 9 additions and 5 deletions
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arch/arm/src/arm/up_head.S
+9 -5
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@@ -59,29 +59,33 @@
* 1. We execute in place in FLASH (CONFIG_BOOT_RUNFROMFLASH=y). In this case
* the boot logic must:
*
* - Configure SDRAM and,
* - Initialize the .data section in RAM.
* - Configure SDRAM,
* - Initialize the .data section in RAM, and
* - Clear .bss section
*/
#ifdef CONFIG_BOOT_RUNFROMFLASH
# error "Configuration not implemented"
# define CONFIGURE_SDRAM
/* 2. We boot in FLASH but copy ourselves to DRAM from better performance.
* (CONFIG_BOOT_RUNFROMFLASH=n && CONFIG_BOOT_COPYTORAM=y). In this case
* the boot logic must:
*
* - Configure SDRAM and,
* - Copy ourself to DRAM (after mapping it)
* - Configure SDRAM,
* - Copy ourself to DRAM (after mapping it), and
* - Clear .bss section
*/
#elif defined(CONFIG_BOOT_COPYTORAM)
# error "configuration not implemented
# define CONFIG_SDRAM
/* 3. There is bootloader that copies us to DRAM (but probably not to the beginning)
* (CONFIG_BOOT_RUNFROMFLASH=n && CONFIG_BOOT_COPYTORAM=n). In this case the
* boot logic must:
*
* - Nothing special.
* - Clear .bss section
*/
#endif