When powered on 1541 reads the disk for a brief moment. Is it used to boot system from floppy? Is it possible to create a bootable commodore 64 floppy?
On the C64, no.
On power up, the drive is resetting and the motor may spin briefly, but the drive is not actually reading the disk.
And even if it were, it is an IEC slave device and cannot initiate communication with the C64/C128 bus master itself.
For an auto boot concept to be implemented, it would have to be the computer's kernal directing the flow of events, on reset.
While theoretically possible to implement, no such option exists on stock C64 machines.
However, the C128 actually implements this concept and at reset checks the sector 0 of track 1 for a special signature boot sector.