4 ms·

the issue about the available RAM is this: https://github.com/raspberrypi/linux/commit/cdb78ce891f6c6367a69c0a46b5779a58164bd4b#diff-634f284364ba43ef69912111615

the issue about the available RAM is this: https://github.com/raspberrypi/linux/commit/cdb78ce891f6c6367a69c0a46b5779a58164bd4b#diff-634f284364ba43ef69912111615b08ef https://github.com/raspberrypi/linux/commit/cdb78ce891f6c636... probably some kind of address mapping, but I'm no expert on this stuff ;-)

vardump 7y ago
Saw that, but that doesn't really tell why, and how much effort is required to solve this. Maybe SD stuff is in the VideoCore side, and it simply can't DMA above 1 GB limit, and requires to have below 1GB DMA buffers + copy for transfers to upper memory. Maybe.