Youâre right. I thought I had erased eMMC, but it appears not. Thanks.
Iâm now not able to get the board into MASKROM mode. The TST approach from the wiki doesnât work. On the serial console, I see that it causes the âboot timesâ counter to reset to zero, but otherwise keeps loping.
I also tried the MRegister mode, but itâs not clear from the wiki what the âtwo pads of the M registerâ are. I see a single test-point labeled M, which based on the VIM3 schematics (I hope they are the same as VIM3L for this part) looks like TP7, connected to GND. Based on that, I connect R84 to TP7 and this seems to disable the eMMC.
However, this does not seem to enable USB boot for the MASKROM as expected. Rather, it continues to keep booting from the eMMC, but fails to load FIPs from eMMC.
Looking at the initial string SM1:BL:511f6b:81ca2f;FEAT:A0F83180:20282000;POC:D;RCY:0;USB:0;EMMC:0;READ:0;0.0;CHK:0;
it seems like the MASKROM is not detecting a USB connection (even though USB-C is conntected to host PC)