10.1 Release and 11.0 Current UEFI boot fail on AMD Athlon 5350 + ASUS AM1M-A if integrated video memory size > 128 mb (set in BIOS).
There have been a number of EFI framebuffer fixes committed after 10.2. Can you test again with a stable/10 or -current snapshot?
This is presumed fixed by the EFI framebuffer fixes a few months ago. Please resubmit if you encounter this issue on a recent -CURRENT or stable/10 snapshot (head after r277735, stable/10 after r292551), or with an upcoming 10.3 beta image.