Posts made by François Levaux

Hi @Boken-Lin , your explanation make sense. This is not the case. For some reason, it is now persistent without changing a thing. This is quite weird to me. Thanks!

@Boken-Lin posted GPIO8 is for on board LED:
https://community.onion.io/topic/360/0-0-5-b251-gpio8-vs-others/2

Thanks @Boken-Lin -- It makes more sense.
My understanding from https://wiki.onion.io/Tutorials/Using-the-GPIOs is that it's a standard GPIO. Would you need to update this diagram?

So it's more interesting than I thought originally.

When upgrading system to b251, it overwrote /etc/config/fstab, which is documented in https://community.onion.io/topic/362/0-0-5-b251-etc-config-fstab-not-persistent

Then I didn't knew I had to export my GPIOs to get them on sysfs.
interesting thing is that I had only /sys/class/gpio/gpio8 present.

Perhaps someone messed something with gpio8 ?

root@Omega-15B0:~# echo 8 > /sys/class/gpio/export 
ash: write error: Device or resource busy
root@Omega-15B0:~# echo 8 > /sys/class/gpio/unexport 
ash: write error: Invalid argument
root@Omega-15B0:~# 

Since updating to 0.0.5 b251, /etc/config/fstab is not persistent

I used to change it to override the /overlay partition with my USB storage, as directed by https://wiki.onion.io/Tutorials/Using-USB-Storage-as-Rootfs

However, this file is not persistent across reboots.

I get this after reboot:

root@Omega-15B0:~# cat /etc/config/fstab 
config 'global'
	option	anon_swap	'0'
	option	anon_mount	'0'
	option	auto_swap	'1'
	option	auto_mount	'1'
	option	delay_root	'5'
	option	check_fs	'0'

config 'mount'
	option	target	'/overlay' 
	option	uuid	'3ca7-8276'
	option	enabled	'1'

While I should be getting:

root@Omega-15B0:~# cat /etc/config/fstab 
config 'global'
	option	anon_swap	'0'
	option	anon_mount	'0'
	option	auto_swap	'1'
	option	auto_mount	'1'
	option	delay_root	'5'
	option	check_fs	'0'

config 'mount'
	option	target	'/overlay' 
	option	uuid	'2cca1b40-e417-4a30-9917-d0efa4864f05'
	option	enabled	'1'

Any insight?

Since updating to 0.0.5 b251, I lost all my GPIO's but gpio8 in /sys/class/gpio/
Is this expected?

Also, gpio8 still has no support of 'direction'.
See https://community.onion.io/topic/40/simple-python-wrapper-and-demo from @dan-l

I would be interested as well, even better, use it with python

Hi friends,

If you've followed https://wiki.onion.io/Tutorials/Using-USB-Storage-as-Rootfs for pivot-overlay, you might had some errors in dmesg. This is because USB Storage needs to be formatted in Ext4!

To do this:
0. Update your packages opkg update

1. Plug your USB Storage
2. Install e2fsprogs: opkg install e2fsprogs
3. Format the device as a ext4: mkfs.ext4 /dev/sda1 (change sda1 for your device)

I've documented this here: http://gdgbasel.com/2015/12/06/installing-python-on-onion-omega/

Happy Hacking!