1. Well I guess you've altered the kernel command line? Can you write down a brief summary what steps it takes to make it run & I'll add it to FAQ section. I guess there's reason why AMD does not use the AMDGPU driver at default for these cards so maybe not all work out of the box.
1. make the flash partition writable:
2. edit /flash/syslinux.cfg, find the line starting with "APPEND boot=" and add to it radeon.si_support=0 amdgpu.si_support=1 kernel command-line switches for GCN 1.0 GPUs or radeon.cik_support=0 amdgpu.cik_support=1 for GCN 1.1 GPUs.
3. save and reboot
I can add the .chd file format but my es_systems is just a suggestion and everyone can change it according to their needs.
I never tried video previews in ES or Pegasus because IMHO it's just a space consuming gimmick but if it's broken I need a log file.
Just a segfault or something interesting in the logs? As I said I never used it at all and have no clue how to set up CEC
for es_sytems I agree with you but it's cool to have good and complete default options.
I'll put a log later for pegasus!