> The firmware on a pi4 with 2GB or 4GB RAM will only report 1GB. > I believe you need to look at the board id (or probe for invalid > addresses as in the teg2 kernel) to find out the real amount.
oh dear. i dont even know the expected physical memory map... i guess that ram is continuous block at [0-0xfc000000). but some memory might be reserved... on what method does it report only 1GB? i know of 3 methods so far: - atags - device tree /memory/reg property - firmware property request (getramsize() in vcore.c) for me getramsize() returns zero for both base and limit so its completely useless. i'm currently using device tree method, but the code assumes that there is a single block entry. lets see if that lies as well with the debug kernel. -- cinap
