Raspberry Pi images with FBTFT support

[Florian95]

Hello,

Can I use rpi-update with the Raspberry Pi images with FBTFT support ?

Regards,

[Florian95]

Answer : NO

$ lsmod
Module Size Used by
snd_bcm2835 16304 0
snd_pcm 77560 1 snd_bcm2835
snd_page_alloc 5145 1 snd_pcm
snd_seq 53329 0
snd_seq_device 6438 1 snd_seq
snd_timer 19998 2 snd_pcm,snd_seq
snd 58447 5 snd_bcm2835,snd_timer,snd_pcm,snd_seq,snd_seq_device
syscopyarea 3136 0
sysfillrect 3302 0
sysimgblt 2195 0
fb_sys_fops 1404 0
backlight 4793 0
8188eu 576997 0
leds_gpio 2235 0
led_class 3562 1 leds_gpio

$ sudo modprobe sainsmart18fb
ERROR: could not insert 'sainsmart18fb': Invalid argument

[Florian95]

Even with

$ lsmod
Module Size Used by
snd_bcm2835 16273 0
snd_pcm 78130 1 snd_bcm2835
snd_page_alloc 5129 1 snd_pcm
snd_seq 53349 0
snd_seq_device 6454 1 snd_seq
snd_timer 19946 2 snd_pcm,snd_seq
snd 58506 5 snd_bcm2835,snd_timer,snd_pcm,snd_seq,snd_seq_device
sainsmart18fb 4038 0
fbtft 20317 1 sainsmart18fb
syscopyarea 3136 1 fbtft
sysfillrect 3302 1 fbtft
sysimgblt 2195 1 fbtft
fb_sys_fops 1404 1 fbtft
8188eu 576997 0
leds_gpio 2197 0
led_class 3592 1 leds_gpio

[notro]

No, I don't think it can be used.
rpi-update updates among other things: the kernel. This new kernel won't have deferred_io and backlight compiled in.
This is needed by fbtft.
That beeing said, the FBTFT image contains a quite new kernel, since it is build from github source.

What will you achieve using it?

[HansZimmer]

I tried that before reading this... :)
Is it possible to install a kernel with FBTFT support after rpi-update?

[notro]

You can copy the FBTFT image to your Pi and use information from https://github.com/notro/fbtft/wiki/FBTFT-image-build-process#image to mount the image and extract the kernel and modules

[notro]

Maybe this will work: sudo SKIP_KERNEL=1 rpi-update
Haven't tried it.
Ref: https://github.com/Hexxeh/rpi-update/blob/master/README.md

[notro]

See #10