Hi, my boards arrived. :) Putting a jumper between pins 71 and 30 did work: as in, I could power up the board, connect USB Serial/JTAG, burn PXA0_TIEH_SEL_0 to 0b10, and confirm that LDO1 was outputting 1.8V. The jumper could then be closed and firmware could be loaded normally.
However! If the ...

Seems like it might be possible to put the jumper between pins 71 and 30, if LDO1 is upstream from the entire flash power domain?

OK, thanks.
Is this the sort of thing that's likely to get corrected in a silicon revision?
It seems like 1.8V flash is markedly more efficient, would be nice to be able to use it for battery-powered applications.

thanks for looking!

BTW, I measured the flash voltage on an ESP32-P4-EYE in joint download mode, and i'm still seeing 3.3V on LDO1.

so I guess I will spin my board with a DNP resistor between LDO1 and the flash chip... hope it will not still try to put 3.3V logic on the QSPI pins?

waveshare also has the p4-pico: https://www.waveshare.com/wiki/ESP32-P4-Pico
and it looks like this module is in development, though i'm not sure it's released yet: https://circuitpython.org/board/solderp ... _stamp_xl/

You could power it without flash attached, put it in download mode, and burn fuse


Yes, but I want to make a PCB where the flash is attached before having been programmed.
My solution at this point is to include a cut/solder jumper to ensure that the first time the ESP turns on, it starts in ...

Hi all,

I'm working on a board using the ESP32-P4, and I'm considering the use of a 1.8V NOR flash chip.
It looks like the internal Flash LDO is switchable between 1.8V and 3.3V, settable via eFuse. OK, all makes sense.
Except - if I make a board with 1.8V flash, how do I safely power it on for the ...