How do I compile kernel patch ?

fdef · December 8, 2017 at 5:08 PM

Hi,

I need to make my odroid-c2 work with Usb Dac nuforce2. (Usb DAC audio issue (crackling, pops, clicks))

I need to recompile linux kernel with the patch below:

usb: allow some timings to be tweak from cmdline · hardkernel/linux@5b39258 · GitHub

I dont find documentation about that.

Any help ?

Thx

**kszaq** · December 8, 2017 at 8:56 PM

There is no very easy way - what you can try to do is:

read compile [LibreELEC]
download source from the branch you want (e.g. git clone https://github.com/LibreELEC/LibreELEC.tv -b libreelec-8.2
download patch to projects/Odroid_C2/patches/linux
build kernel ARCH=aarch64 PROJECT=Odroid_C2 ./scripts/build linux

Keep in mind that this involves building whole toolchain which takes time when you build for the first time.

fdef · December 10, 2017 at 3:15 PM

Thanks for your help.

The build is in progress.

Note for others, to download patch from github, check the exemple (you need to add manualy '.patch' in the github url):

Code

curl -L https://github.com/hardkernel/linux/commit/5b39258a76be9cd385ea7b45a8a21e08992eb6e5.patch >  projects/Odroid_C2/patches/linux/linux-009-usb-allow-some-timings-to-be-tweak-from-cmdline.patch

fdef · December 10, 2017 at 3:40 PM

Oups! How to bind the building on the correct kernel ?

Code

APPLY PATCH (project)   projects/Odroid_C2/patches/linux/linux-009-usb-allow-some-timings-to-be-tweak-from-cmdline.patch
patching file drivers/amlogic/usb/dwc_otg/310/dwc_otg_hcd_queue.c
Hunk #2 FAILED at 378.
1 out of 2 hunks FAILED -- saving rejects to file drivers/amlogic/usb/dwc_otg/310/dwc_otg_hcd_queue.c.rej

drivers/amlogic/usb/dwc_otg/310/dwc_otg_hcd_queue.c.rej

Diff

--- drivers/amlogic/usb/dwc_otg/310/dwc_otg_hcd_queue.c
+++ drivers/amlogic/usb/dwc_otg/310/dwc_otg_hcd_queue.c
@@ -378,14 +390,19 @@ static int check_periodic_bandwidth(dwc_otg_hcd_t *hcd, dwc_otg_qh_t *qh)
         * High speed mode.
         * Max periodic usecs is 80% x 125 usec = 100 usec.
         */
-
-       max_claimed_usecs = 125 - qh->usecs;
+       if(usb_timing_tweak)
+           max_claimed_usecs = 125 - qh->usecs;
+       else
+           max_claimed_usecs = 100 - qh->usecs;
    else
        /*
         * Full speed mode.
         * Max periodic usecs is 90% x 1000 usec = 900 usec.
         */
-       max_claimed_usecs = 1000 - qh->usecs;
+       if(usb_timing_tweak)
+           max_claimed_usecs = 1000 - qh->usecs;
+       else
+           max_claimed_usecs = 900 - qh->usecs;

    if (hcd->periodic_usecs > max_claimed_usecs) {
        DWC_INFO("%s: already claimed usecs %d, required usecs %d\n", __func__, hcd->periodic_usecs, qh->usecs);

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pastit · December 30, 2017 at 9:28 PM

kszaq please, isn't this patch already in some of yours newer releases (Index of /s905/8.2) ?

Quote from kszaq

There is no very easy way - what you can try to do is:

read compile [LibreELEC]

download source from the branch you want (e.g. git clone https://github.com/LibreELEC/LibreELEC.tv -b libreelec-8.2

download patch to projects/Odroid_C2/patches/linux

build kernel ARCH=aarch64 PROJECT=Odroid_C2 ./scripts/build linux

Keep in mind that this involves building whole toolchain which takes time when you build for the first time.

**kszaq** · December 30, 2017 at 10:10 PM

Quote from pastit

kszaq please, isn't this patch already in some of yours newer releases (Index of /s905/8.2) ?

Yes, you will find it in my latest Odroid-C2 build (i.e. 8.2.2.2).

pastit · December 31, 2017 at 1:25 PM

Quote from kszaq

Yes, you will find it in my latest Odroid-C2 build (i.e. 8.2.2.2).

Thanks, glitches and cracks are gone.

fdef · January 6, 2018 at 9:11 PM

Hi,

I don't understand, I'm running "LibreELEC (official): 8.2.1 (Odroid_C2.aarch64)"

I want to update the system with kszaq's builds but it's not working.

Libreelec told me, the architecture is not compatible.

What can I do ?

**chewitt** · January 7, 2018 at 5:11 AM Official Post

Current C2 releases are aarch64, future C2 releases and kszaq current release are 'arm' so the update process aborts. Instructions on how to override that are shown on-screen under the error/abort message.

fdef · January 7, 2018 at 2:43 PM

Ah ok

So, I have runned the upgrade with the information below and the result was my C2 became "unbootable" (I have on the screen the Libreelec loading image and nothing happen)...

Code

touch /storage/.update/.nocompat
cd .update
wget https://kszaq.libreelec.tv/s905/8.2/8.2.2.3/LibreELEC-S905.arm-8.2-8.2.2.3-C2.tar

I need to reinstall all my configuration setup

I hope it's will be more easier to switch between customs rom and officials. cause I don't want to reinstall all time.

Is it possible to upgrade from 8.2.2.3 to 8.3 for exemple?

thx

**kszaq** · January 7, 2018 at 5:58 PM

fdef After upgrading to my build you should have a new file called boot.ini.update. Remove boot.ini and rename boot.ini.update to boot.ini. This will make your system bootable again.

fdef · January 8, 2018 at 10:29 AM

Quote from kszaq

fdef After upgrading to my build you should have a new file called boot.ini.update. Remove boot.ini and rename boot.ini.update to boot.ini. This will make your system bootable again.

Thx for this notification. I'll remember it !

Do you have any documentation of this information ? Maybe you could provide a README file in your root repository, it will be useful for the other users.

fdef · January 8, 2018 at 10:37 AM

@all,

I confirm the patch embedded in the kszaq custom build works !

I listen again little clicks but it appear only when I navigate the kodi information/menu while the video is running.

How do I compile kernel patch ?

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