PXE OTP/GPIO testing

[jwitch]

I understand that USB/PXE boot is still being tested. Apparently these features are enabled by writing an OTP bit and pulling a GPIO pin.

Therefore, presumably we will need an SD card with a boot.txt config something along the lines of "program_enable_pxe=1" to initially enable PXE booting? Could someone enlighten me what that config is and which GPIO to pull so that I can see DHCP/PXE packets with wireshark?

Many thanks

[fruitoftheloom]

I understand that USB/PXE boot is still being tested. Apparently these features are enabled by writing an OTP bit and pulling a GPIO pin.

Therefore, presumably we will need an SD card with a boot.txt config something along the lines of "program_enable_pxe=1" to initially enable PXE booting? Could someone enlighten me what that config is and which GPIO to pull so that I can see DHCP/PXE packets with wireshark?

Many thanks

Please be aware that is is only for the RPi 3B at present and has already been discussed:

viewtopic.php?f=63&t=138071

viewtopic.php?f=91&t=138786&start=50

search.php?keywords=pxe&t=137932&sf=msgonly

etcetera etcetera etcetera

[gregeric]

Hi jwitch & welcome to the forums

See https://github.com/raspberrypi/document ... /Readme.md

[fruitoftheloom]

Hi jwitch & welcome to the forums

See https://github.com/raspberrypi/document ... /Readme.md

This is preliminary information used by the beta testers for the development of the bootcode for mass storage and ethernet boot, but it is currently incorrect and not working.

[0xFF]

Is

Code: Select all

program_usb_boot_mode=1

option reversible ?

Can I disable usb boot option back, with?

Code: Select all

program_usb_boot_mode=0

AFAIK OTP means one-time programming read-only memory

[Aydan]

Is

Code: Select all

program_usb_boot_mode=1

option reversible ?

Can I disable usb boot option back, with?

Code: Select all

program_usb_boot_mode=0

AFAIK OTP means one-time programming read-only memory

AFAIK it's not reversible, but why would you need to. USB boot is the last boot option, so as long as an SD card is inserted with valid boot files, you won't even get to USB.

Regards
Aydan