diff options
Diffstat (limited to 'nuttx/arch/hc/src/mc9s12ne64/mc9s12ne64_start.S')
| -rwxr-xr-x | nuttx/arch/hc/src/mc9s12ne64/mc9s12ne64_start.S | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/nuttx/arch/hc/src/mc9s12ne64/mc9s12ne64_start.S b/nuttx/arch/hc/src/mc9s12ne64/mc9s12ne64_start.S index 75613d8a8..c99ca3a15 100755 --- a/nuttx/arch/hc/src/mc9s12ne64/mc9s12ne64_start.S +++ b/nuttx/arch/hc/src/mc9s12ne64/mc9s12ne64_start.S @@ -44,14 +44,19 @@ #include "mc9s12ne64_internal.h" #include "mc9s12ne64_mmc.h" #include "mc9s12ne64_crg.h" +#include "mc9s12ne64_flash.h" /**************************************************************************** * Private Definitions ****************************************************************************/ -/************************************************************************************ +#define INITRG_REG (MMC_INITRG_REG(HCS12_REG_BASE)) +#define INITRM_MAP (MMC_INITRM_RAM(HCS12_SRAM_BASE)|MMC_INITRM_RAMHAL) +#define INITEE_EE (MMC_INITEE_EE(HCS12_EEPROM_BASE)|MMC_INITEE_EEON) + +/**************************************************************************** * Global Symbols - ************************************************************************************/ + ****************************************************************************/ .globl __start .globl os_start @@ -71,19 +76,24 @@ #endif .endm -/* Memory map initialization */ - +/* Memory map initialization. + * + * The MC9S12NE64 has 64K bytes of FLASH EEPROM and 8K bytes of RAM. + */ + .macro MMCINIT - movb #0x00, HCS12_MMC_INITRG /* Set the register map position to 0x0000*/ + /* Registers are always positioned at address 0x0000 */ + + movb #INITRG_REG, HCS12_MMC_INITRG /* Set the register map position to 0x0000*/ nop -#ifdef CONFIG_HCS12_SERIALMON - movb #0x39, HCS12_MMC_INITRM /* Set RAM position to 0x3800 to end at 0x3fff */ -#else - movb #0x20, HCS12_MMC_INITRM /* Set RAM position to 0x2000*/ -#endif + /* Position SRAM so that is ends at address 0x3fff. This is required + * because the Freescale serial monitor initializes its stack to the + * end+1 of SRAM which it expects to be at address 0x4000 + */ - movb #0x09, HCS12_MMC_INITEE /* Set EEPROM position to 0x0800 */ + movb #INITRM_MAP, HCS12_MMC_INITRM /* Set RAM position to 0x2000-0x3fff */ + movb #INITEE_EE, HCS12_MMC_INITEE /* Set EEPROM position to 0x0800 */ movb #MMC_MISC_ROMON, HCS12_MMC_MISC /* MISC: EXSTR1=0 EXSTR0=0 ROMHM=0 ROMON=1 */ .endm |