Anyone tried this out yet?
Someone in this thread took it for a spin.
Thank you for the link!
I got it to work as well now.
I didn’t get response for the bug: https://bugs.96boards.org/show_bug.cgi?id=677; and Hikey960 have no official releasing for rpb and debian rootfs, so this is why we have no preceding.
Regard of the hdmi display issue, I found the rpb rootfs image which can display HDMI properly, it has below fbset configurations:
root@hikey960:/etc# fbset mode "1920x1080" geometry 1920 1080 1920 1080 32 timings 0 0 0 0 0 0 0 accel true rgba 8/16,8/8,8/0,0/0 endmode
But for broken rpb rootfs image, it has below configurations:
root@hikey960:~# fbset mode "800x600" geometry 800 600 800 600 32 timings 0 0 0 0 0 0 0 accel true rgba 8/16,8/8,8/0,0/0 endmode
And I found I cannot manually change the framebuffer setting by command:
root@hikey960:~# fbset -fb /dev/fb0 -g 1920 1080 1920 1080 16 ioctl FBIOPUT_VSCREENINFO: Invalid argument
I am not familiar with framebuffer/display drivers, I will try to inquire colleagues with related expertise; also very welcome if you have any suggestion for this.
Thanks a lot @leo-yan for your effort,
I have two questions related to this issue now:
- Do you have ever successfully displayed anything based on a recent RPB release (like 121 afterwards)？If none of them then I suggest finding out the latest working RPB release, it may be easier to figure out which commit(s) caused this issue then normal debugging.
- Can you tell me how to figure out the actually kernel brance used by RPB build? Recently we have some finding from AOSP side, and we want to have a try on RPB.
Yes, I tried 123/127, both of them cannot display with my 720p LCD display.
Thanks for @Loic & @fabo pointed me, you could refer the discussion for kernel code base from: Which kernel branch is used by the current RPB 4.14 kernel?
Actually rpb building is using git tree is: https://github.com/96boards-hikey/linux/, the last commit id is: 2932b25c8003e773a0b32b52814a5fd17b287567, you could refer the OE morty config file: https://github.com/96boards/meta-96boards/blob/morty/recipes-kernel/linux/linux-hikey960_git.bb.
so, i am am on the following kernel
root@linaro-developer:~# uname -a Linux linaro-developer 4.15-hikey #1 SMP PREEMPT Sat Mar 10 22:41:04 UTC 2018 aarch64 GNU/Linux
And /dev/fb0 isn’t available
also lsmod shows this:
root@linaro-developer:~# lsmod Module Size Used by bnep 24576 2 arc4 16384 2 wl18xx 143360 0 wlcore 282624 1 wl18xx mac80211 421888 2 wl18xx,wlcore cfg80211 335872 3 wl18xx,wlcore,mac80211 wlcore_sdio 16384 0 hci_uart 65536 0 adv7511 28672 0 cec 49152 1 adv7511 drm_kms_helper 180224 1 adv7511 drm 438272 2 adv7511,drm_kms_helper crc32_ce 16384 0 crct10dif_ce 16384 0 bluetooth 602112 23 hci_uart,bnep ecdh_generic 24576 2 bluetooth ip_tables 24576 0 x_tables 40960 1 ip_tables btrfs 1024000 0 xor 20480 1 btrfs zstd_decompress 77824 1 btrfs zstd_compress 159744 1 btrfs xxhash 16384 2 zstd_compress,zstd_decompress raid6_pq 106496 1 btrfs root@linaro-developer:~#
Any ideas, I know it was working earlier for me…
That is weird, this used to work for me as well with a fbdev. However, looking at the code I don’t find where the fbdev is created. All the coder related to FBDEV initialization is commented: https://github.com/96boards-hikey/linux/blob/hikey960-upstream-rebase/drivers/gpu/drm/hisilicon/kirin960/kirin_drm_drv.c#L142 (from initial integration of the driver).
@sumit.garg AFAIK you have a working display with your hikey960/linux, any idea ?
@ric96 Looking at kernel version, it seems you are running Debian on which HDMI/DRM drivers doesn’t seems to work. So I had to install custom 96boards hikey kernel (https://github.com/96boards-hikey/linux/commits/hikey960-upstream-rebase) on Debian and passed “video=HDMI-A-1:1280x800@60” in cmdline for my 24 inch monitor screen.
Kernel install steps:
“Image.gz” should be used to replace /boot/vmlinuz-4.15-hikey image.
And for device tree, you will get hi3660-hikey960.dtb image. Place this image in “/boot/” directory. Reboot and press “e” when you get GRUB menu. Just add following line in the configuration:
With that kernel if I add the video=HDMI-A-1:1280x800@60 cmd, it results in a panic during boot else it fails to find rootfs and goes into initramfs
could not open builtin file '/lib/modules/4.14.0-rc7-hikey-linaro/modules.builtin.bin' Begin: Running /scripts/local-block ... done. Begin: Running /scripts/local-block ... done. Begin: Running /scripts/local-block ... done. Begin: Running /scripts/local-block ... done. Begin: Running /scripts/local-block ... done. done. Gave up waiting for root file system device. Common problems: - Boot args (cat /proc/cmdline) - Check rootdelay= (did the system wait long enough?) - Missing modules (cat /proc/modules; ls /dev) ALERT! UUID=230350e9-f100-4e71-a796-4d1c259fec71 does not exist. Dropping to a shell! (initramfs)
@ric96 Please check if you followed following build steps:
./scripts/kconfig/merge_config.sh arch/arm64/configs/defconfig arch/arm64/configs/hikey960_defconfig
aahh… that worked but i guess this kernel doesn’t support sdcard, so i still end up booting to initramfs
@ric96 So your HDMI worked with kernel boot-logs displayed on Monitor, right? I am not sure about sdcard as I have used Debian rootfs flashed on UFS.
yes hdmi worked, but currently i require emmc to run aosp that’s why i was booting on sdcard and that didn’t work
What I did:
1. Plug-in HDMI before booting 2. Boot 3. Start X 4. Check fb0, it should be there.
However, if you want X actually work, you need to follow the instruction from Leo to add X11 config for fbdev as well.
if you run
apt update apt dist-upgrade
and reboot, does it still run?
Is there a link / readme that provides complete set of instructions to build with HDMI support for HiKey960 ?
I am trying to build  from source, to be able to get GUI via HDMI output.
I am afraid that there isn’t any specific readme for this particular kernel version , did you try instructions listed in this post to enable HDMI?