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components/bootloader: fix enabling cache for APP CPU

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This is a workaround for a hardware bug with cache initialization.
Only two lines of code related to DPORT_APP_CACHE_MMU_IA_CLR were added around mmu_init(1); call,
and two lines at the end of comment block.
I reformatted surrounding lines to use spaces for indentation, like the rest of the code in this file does.
This commit is contained in:
Ivan Grokhotkov 2016-08-24 16:25:04 +08:00
parent be112daa71
commit 4d1084120c
1 changed files with 22 additions and 17 deletions
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39
components/bootloader/src/main/bootloader_start.c
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@ -92,23 +92,28 @@ void IRAM_ATTR call_start_cpu0()
//Clear bss
memset(&_bss_start, 0, (&_bss_end - &_bss_start) * sizeof(_bss_start));
/* completely reset MMU for both CPUs
(in case serial bootloader was running) */
Cache_Read_Disable(0);
Cache_Read_Disable(1);
Cache_Flush(0);
Cache_Flush(1);
mmu_init(0);
mmu_init(1);
/* (above steps probably unnecessary for most serial bootloader
usage, all that's absolutely needed is that we unmask DROM0
cache on the following two lines - normal ROM boot exits with
DROM0 cache unmasked, but serial bootloader exits with it
masked. However can't hurt to be thorough and reset
everything.)
*/
REG_CLR_BIT(PRO_CACHE_CTRL1_REG, DPORT_PRO_CACHE_MASK_DROM0);
REG_CLR_BIT(APP_CACHE_CTRL1_REG, DPORT_APP_CACHE_MASK_DROM0);
/* completely reset MMU for both CPUs
(in case serial bootloader was running) */
Cache_Read_Disable(0);
Cache_Read_Disable(1);
Cache_Flush(0);
Cache_Flush(1);
mmu_init(0);
REG_SET_BIT(APP_CACHE_CTRL1_REG, DPORT_APP_CACHE_MMU_IA_CLR);
mmu_init(1);
REG_CLR_BIT(APP_CACHE_CTRL1_REG, DPORT_APP_CACHE_MMU_IA_CLR);
/* (above steps probably unnecessary for most serial bootloader
usage, all that's absolutely needed is that we unmask DROM0
cache on the following two lines - normal ROM boot exits with
DROM0 cache unmasked, but serial bootloader exits with it
masked. However can't hurt to be thorough and reset
everything.)
The lines which manipulate DPORT_APP_CACHE_MMU_IA_CLR bit are
necessary to work around a hardware bug.
*/
REG_CLR_BIT(PRO_CACHE_CTRL1_REG, DPORT_PRO_CACHE_MASK_DROM0);
REG_CLR_BIT(APP_CACHE_CTRL1_REG, DPORT_APP_CACHE_MASK_DROM0);
bootloader_main();
}