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| author | Gregory Nutt <gnutt@nuttx.org> | 2015-04-04 19:58:31 -0600 |
|---|---|---|
| committer | Gregory Nutt <gnutt@nuttx.org> | 2015-04-04 19:58:31 -0600 |
| commit | aed36df7b217172ad2a10ff75817e096a8d41ece (patch) | |
| tree | 3cd9a845fe75a1ae746ec524f8864b26f4909074 /nuttx/arch | |
| parent | 58438faa479281955d3292193ad2aca8e3fb67da (diff) | |
| download | px4-nuttx-aed36df7b217172ad2a10ff75817e096a8d41ece.tar.gz px4-nuttx-aed36df7b217172ad2a10ff75817e096a8d41ece.tar.bz2 px4-nuttx-aed36df7b217172ad2a10ff75817e096a8d41ece.zip | |
SAMV7: Fix SDRAM initialization instabiilties by changing the order of initialization
Diffstat (limited to 'nuttx/arch')
| -rw-r--r-- | nuttx/arch/arm/src/samv7/sam_start.c | 40 |
1 files changed, 4 insertions, 36 deletions
diff --git a/nuttx/arch/arm/src/samv7/sam_start.c b/nuttx/arch/arm/src/samv7/sam_start.c index 7649c9d46..82199b09d 100644 --- a/nuttx/arch/arm/src/samv7/sam_start.c +++ b/nuttx/arch/arm/src/samv7/sam_start.c @@ -118,20 +118,6 @@ void __start(void) __attribute__ ((no_instrument_function)); #endif /**************************************************************************** - * Name: showprogress - * - * Description: - * Print a character on the UART to show boot status. - * - ****************************************************************************/ - -#ifdef CONFIG_DEBUG -# define showprogress(c) up_lowputc(c) -#else -# define showprogress(c) -#endif - -/**************************************************************************** * Name: sam_fpuconfig * * Description: @@ -372,12 +358,15 @@ void __start(void) sam_clockconfig(); sam_fpuconfig(); sam_lowsetup(); - showprogress('A'); /* Enable/disable tightly coupled memories */ sam_tcmenable(); + /* Initialize onboard resources */ + + sam_boardinitialize(); + /* Enable I- and D-Caches */ arch_dcache_writethrough(); @@ -389,7 +378,6 @@ void __start(void) #ifdef USE_EARLYSERIALINIT up_earlyserialinit(); #endif - showprogress('B'); /* For the case of the separate user-/kernel-space build, perform whatever * platform specific initialization of the user memory is required. @@ -399,30 +387,10 @@ void __start(void) #ifdef CONFIG_BUILD_PROTECTED sam_userspace(); - showprogress('C'); -#endif - - /* Initialize onboard resources */ - - sam_boardinitialize(); - showprogress('D'); - -#ifdef CONFIG_SAMV7_CMCC - /* Enable the Cortex-M Cache - * - * REVISIT: This logic is complete but I have not yet tried to enable it. - * I have some questions about how the cache will effect memory mapped - * register accesses. - */ - - sam_cmcc_enable(); #endif /* Then start NuttX */ - showprogress('\r'); - showprogress('\n'); - #ifdef CONFIG_STACK_COLORATION /* Set the IDLE stack to the coloration value and jump into os_start() */ |