Greetings,
The AM1I-A [1] is supported by Coreboot, while the AM1M-A [2] is not. The latter seems to be a larger version of the first, with more expansion options.
For the smaller 'I' not much is stated in the manual [3] except to check the "qualified vendor list" on ASUS' site. It does list sizes for unbuffered, non-ecc memory though. I've also read from people testing it that the board doesn't post with ECC installed under the proprietary bios.
According to the manual [4], the larger board ('M') supports unbuffered ECC (and only ECC?) and from what I've read ECC error injection works as expected in memtest86.
What is the probability that ECC will work with the 'I' under Coreboot? (I would expect not much if it's not wired for it, but I don't know how similar these boards are)
How hard would it be to port Coreboot from the 'I' to the larger 'M"? What steps would be required? (was previously mentioned breifly in [5])
Sincerely, -Matt
[1] https://www.asus.com/us/Motherboards/AM1IA/ [2] https://www.asus.com/us/Motherboards/AM1MA/ [3] https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM1/AM1I-A/E8963_AM1I-A.pdf [4] https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM1/AMD_SoC_APU/AM1M-A/E9004_AM1... [5] https://mail.coreboot.org/pipermail/coreboot/2018-February/086145.html