I need clarification on part 2.14.2 of Errata - Wrong data may be read from Message RAM by the CPU when using two FDCANs. As a workaround, it's stated there that "To avoid concurrent read accesses between the CPU and FDCANs, use only one FDCAN at a time."
I do not understand, whether this means, that only one FDCAN can work at the same time and second one must be off (effectively chip having only one functional FDCAN), or if it means that you merely need to avoid reading from both peripherals "at the same time".
I cannot get two FDCANs going whatever I try. Even bog standard configuration copied from examples doesn't work. I have them configured to use different message RAM addresses of course.
EDIT1: If anybody needs this, I got it partially working. FDCAN clock was set to 400 MHz and Cube was fine with it, 55.3.5 of Reference manual states, that fdcan_ker_ck is designed to operate up to 80 MHz, so if FDCAN works but is acting weird, you could have it overclocked. I'm still getting some hard faults, so I'll edit this again when I solve it.
