Given the following autoboot.tat file which is being used to allow multi-booting of various operating systems for testing and development.
I use this with a five-position DIP switch tied to certain GPIO pins to select one of six possible operating systems to boot. Note that the technical details of how the selection is actually made and the particular operating system is booted is outside the scope of this question, though I will be happy to discuss this with any interested person.
Spoiler: The selection of a particular GPIO pin, (by pulling it down), forces an immediate jump to the associated BOOT partition, and things proceed normally from there.
Note that the format of the autoboot.txt file isWhat I want to do is allow for combinations of GPIO pins to select something; Such as:Possible answer?
The documentation for config.txt mentions that filters can be cascaded. So, theoretically, I should be able to do this:My thinking is that when you get to a block that starts with a condition that is not true, the entire block is skipped. However if the first condition is true then it drops to the second condition and if that's true, it boots the selected partition.
Correct? Is there a better way? Or is this just not a happening thing?
Yes, I know that I can do this with a specialized startup script in PINN, but I'd really rather do it within the confines of the autoboot.txt file
I use this with a five-position DIP switch tied to certain GPIO pins to select one of six possible operating systems to boot. Note that the technical details of how the selection is actually made and the particular operating system is booted is outside the scope of this question, though I will be happy to discuss this with any interested person.
Code:
# Setup GPIO pins, set as inputs, (ip), pulled high, (pu).## Pin/dip-switch mapping for GPIO O/S selection:# Dip-switch Broadcomm pin Physical pin Used to select:# None (default) -- -- Buster (Legacy) - Set up as dev environment# 1 21 40 GoPiGo 3.0.3 Waveshare e-Paper Display with buttons# 2 26 37 GoPiGo 3.0.3 Adafruit 16x2 LCD Display with buttons# 3 20 38 GoPiGo 3.0.3 Adafruit 128x32 OLED display# 4 19 35 Bullseye 32 bit# 5 16 36 unused at the present time# common pins are wired together 39 ground connection for all dip switchesgpio=21=ip,pugpio=26=ip,pugpio=20=ip,pugpio=19=ip,pugpio=16=ip,pu[default]# Default if no switches are selected# Buster Legacyboot_partition=5[all][gpio21=0]# Waveshare e-Paper Display with buttonsboot_partition=6[all][gpio26=0]# Adafruit 16x2 LCD Display with buttonsboot_partition=7[all][gpio20=0]# Adafruit 128x32 OLED display (no buttons)boot_partition=8[all][gpio19=0]# Bullseye 32 bitboot_partition=9[all]Note that the format of the autoboot.txt file is
Code:
[condition]boot partition[foo] if true[all] <= ends conditional blockCode:
[gpio19=0 AND gpio20=0] - (or gpio 19, 20, and 21 are all true)boot partition[foo] if BOTH/ALL are true[all]The documentation for config.txt mentions that filters can be cascaded. So, theoretically, I should be able to do this:
Code:
[gpio1=0]boot=partitionX[all][gpio2=0]boot=partitionY[all][gpio3=0]boot=partitionZ[all][gpio1=0][gpio2=0]boot=partitionA[all][gpio1=0][gpio3=0]boot=partitionB[all]Correct? Is there a better way? Or is this just not a happening thing?
Yes, I know that I can do this with a specialized startup script in PINN, but I'd really rather do it within the confines of the autoboot.txt file
Statistics: Posted by jharris1993 — Mon Aug 05, 2024 5:14 pm