Posted on May 17, 2011 at 11:32Hi guys,
I am writing a C low level startup sequence for the STR912FW44. As soon as the code tries to read flash memory past the 32k memory (address 0x8000 and higher) I get a data abort exception.
Can anyone give me a hint of what I might be missing or doing wrong?
Thanks!
Pieter
Here is my C initialisation code:
void LowLevelInit(void)
{
/* ''Buffered'' is defined in ''91xconf.h'' */
#ifdef Buffered
__asm__ __volatile__(
''mrc p15, 0, r0, c1, c0, 0 \n\t'' /* Read CP15 c1, Control Register */
''orr r0, r0, #0x8 \n\t'' /* Enable BIU write buffer on AMBA AHB */
''mcr p15, 0, r0, c1, c0, 0 \n\t'' /* Write CP15 c1, Control Register */
: : : ''r0'');
#endif
/*
* Set bits 17 (Data TCM order bit) and bit 18 (Instruction TCM order bit)
* in the Configuration Control Register.
*/
__asm__ __volatile__(
''mov r0, #0x60000 \n\t''
''mcr p15, 1, r0, c15, c1, 0 \n\t''
: : : ''r0'');
/*
* Map Flash Bank 0 at address 0x0 and Bank 1 at address 0x80000,
* when the bank 0 is the boot bank, then enable the Bank 1.
*/
FMI->BBADR = 0x00000000>>2; /* Set Boot bank base address to 0x00000000 */
FMI->BBSR = 4; /* Set Boot bank size to 512KB */
FMI->NBBADR = 0x00080000>>2; /* Set Non boot bank base address to 0x00080000 */
FMI->NBBSR = 2; /* Set Non boot bank size to 32KB */
FMI->CR = 0x18; /* Enable Flash Boot Bank and Non Boot Bank */
/* Enable SRAM */
SCU->SCR0 = 0x187 | (2 << 3); /* Set System configuration register to 96K SRAM size */
}
