RPi2 memory map - Raspberry Pi Forums

first, awesome document qa7 available us!

now, arm control logic right above gpu peripheral address space (as set 'default' gpu-boot)? address 0x4000 0000 arm physical address?

it's not clear me lower memory regions might used gpu such arm-side should not mess it. vc sdram? what's 'safe' address range arm programs when default files - bootcode.bin , start.elf used? i've gotten impression low addresses (0 - something) have special (gpu-related) use.

turboscrew wrote:first, awesome document qa7 available us!

i agree that.

now, arm control logic right above gpu peripheral address space (as set 'default' gpu-boot)? address 0x4000 0000 arm physical address?

yes.

it's not clear me lower memory regions might used gpu such arm-side should not mess it. vc sdram? what's 'safe' address range arm programs when default files - bootcode.bin , start.elf used? i've gotten impression low addresses (0 - something) have special (gpu-related) use.

the available memory on arm side can determined using mailbox property call (tag 0x00010005). kernel image loaded @ 0x8000. 0x100 on there space used atags. sure not use 0x100-0x7fff may safe use (say) 0x4000-0x7fff (some people do). if not use high-vectors exception vector table has placed @ 0. can change of using config.txt should default map.

raspberrypi