Problem with EMIF boot DM6446

Igor Borisov

Prodigy 80 points

Hello,

My device uses booting from EMIF flash and I have problem with executing of my project.

I had written bootloader. It copies project into ARM RAM, then braches to entry point.

But executing first command "MRS R0, CPSR" places core to reset.(Probably exception because undefined instruction)

However (for experiment) when this command is placed in bootloader. It is executed from EMIF flash correctly

over 9 years ago

0 Igor Borisov over 9 years ago

Prodigy 80 points

also, any other command executed from RAM (with EMIF boot) gives the same problem

0 Igor Borisov over 9 years ago in reply to Igor Borisov

Prodigy 80 points

I found out answer in SPRAY 4A "Booting and Flashing via the DaVinci TMS320DM644x Serial Interface"
It is nessesary a few commands to config ARM memory

MRC p15, #0, r0, c9, c1, #1
MOV r0, #0x1
MCR p15, #0, r0, c9, c1, #1
MRC p15, #0, r0, c9, c1, #0
MOV r0, #0x8000
ORR r0, r0, #0x1
MCR p15, #0, r0, c9, c1, #0

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Problem with EMIF boot DM6446