Hi,
I have a project that uses nRF5340 with MCUboot and multi image update configuration. The update works, but today I noticed that the pcd_sram RAM region seems to be reserved even in the app core image:
> less build/zephyr/linker.cmd
MEMORY
{
FLASH (rx) : ORIGIN = 0x18200, LENGTH = 0xe7e00
RAM (wx) : ORIGIN = 0x20002000, LENGTH = 0x6e000
IDT_LIST (wx)
}
......
> less build/partitions.yml
pcd_sram:
address: 0x20000000
end_address: 0x20002000
placement:
after:
- start
region: sram_primary
size: 0x2000
sram_primary:
address: 0x20002000
end_address: 0x20070000
region: sram_primary
size: 0x6e000
.....
> arm-none-eabi-readelf -S --wide build/zephyr/zephyr.elf
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
......
[19] .ramfunc PROGBITS 20002000 073e28 000000 00 W 0 0 1
[20] datas PROGBITS 20002000 072368 00120c 00 WA 0 0 8
......
If I understand correctly, pcd_sram is used only by the bootloader and only when updating the network core, so why does it have to be reserved in the application core image too (and waste 8K of RAM)? Or maybe my build configuration has an issue? I've searched other posts here and I've seen some people that list a similar configuration, so I still believe something isn't right somewhere.
Using NCS 2.6.1.
Thanks,
Bogdan