Den 25.01.2016 23:07, skrev Stefan Wahren:
Doug Anderson <dianders@xxxxxxxxxxxx> hat am 25. Januar 2016 um 21:44
geschrieben:
Hi,
On Mon, Jan 25, 2016 at 12:05 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
wrote:
On Fri, 22 Jan 2016, Doug Anderson wrote:
Can you tell me how to configure a mainline kernel to work on the
Raspberry Pi? There is no arch/arm/configs/bcmrpi_defconfig.
Not offhand. Again, perhaps someone else on this thread will have
more. I did do a quick Google search and came up with:
http://elinux.org/RPi_Upstream_Kernel_Compilation
...but the Raspberry Pi I have at home is running some home automation
stuff so I don't want to give that a try. :-P
I followed those instructions, and the result doesn't boot. No easy
way to figure out why -- nothing shows up on the HDMI screen but the
color splash.
Interestingly enough Stefan Wahren reached out to me after my recent
patch series indicating that my series didn't fix some other problem
he was having on his Raspberry Pi. Presumably that means he might
have some pointers?
Stefan: do you have any pointer to instructions that Alan can use to
get a booting Raspberry Pi kernel based on mainline Linux?
It sounds like that bootloader doesn't came up.
You will need to add / replace the following files in the FAT partition of an
raspbian:
kernel.img (U-Boot)
boot.scr.uimg
bcm2835-rpi*.dtb (from kernel)
zImage
...another interesting idea would be to try to see if you could just
change the configuration of the Raspberry Pi kernel to switch which
dwc2 driver it used. Presumably their driver was an addition on top
of the driver in "drivers/usb/dwc2". In fact, doing a 'git log' on
drivers/usb/dwc2 in the "rpi-4.4.y" kernel on github it looks pure
(and Stefan is even the last commit author!)
-Doug
dwc2 is broken in Linux 4.4 and newer
We are using dwc2 downstream[1] on 4.4 to get gadget support on
Pi Zero. I didn't add any extra patches to get that working.
The only difference I can think of is that we boot directly from the
firmware bootloader and turn on USB power in the firmware driver.
I have seen strange dwc2 probing errors when USB power is off.
Noralf.
[1] https://github.com/raspberrypi/linux/tree/rpi-4.4.y
Please apply the following patch series:
http://marc.info/?l=linux-usb&m=145255851516121&w=2
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