Yeah these two have me somewhat confused, My first impression was they are SW governed as a result of power demands… possibly the other CPU cores (?) as from memory these rails were not present (and again from memory) were not present even after HOS was booted on some boards which signified a FW version difference… the next thought was possibly one of these IC’s was dediicated to GPU power rails, but i couldn’t find anything conclusive in the avaliable datasheets without a correct pinout to verify. Then, from memory again, i recall measuring approx 1.4V from one of these IC’s (depending on load) which is uncharacteristic for a CPU VCORE.
The only reason for those thoughts is the assumption that primary CPU core would be present and ready to go after bootloader stage and the only example of that I’ve found would be at the max PMIC afaict.
Thanks man, i suppose it’s like chinese whispers and things spread and are morphed, but tbh i should have realised the IC sooner, the fact that the output was on the wrong side (left) should have been a clear indication this was a Japanese manufactured part but i got my R’s mixed up and thinking i already checked all availiable manufacturers (Rohm for example)…
btw i saw your post over on GBATemp ages ago and it definately made me smile, regarding your magic soldering iron, definately had a few situations like that in the past causing scratching of the head… would be curious to know if you identified the root cause of those failures?