After diffing the working dtb and the failing one (meson-gxl-s905d-phicomm-n1.dtb from compiling the kernel by hand), the issue was found to be the incorrectly high max-frequency specified in meson-gx-p23x-q20x.dtsi: mmc@7400Continue reading
Yes it’s the patch metioned in [v2,0/6] ARM64: meson: GXBaby (S905) and Vega S95 enablement. You might also would like to take a look at how did I build DebianContinue reading
Phicomm N1 uses BCM4345/6. The driver for that chip should come with kernel and needs no extra steps. It’s the firmware that is missing. Hence the firmware should be installedContinue reading
Cross build Debian 9 for N1 This is what the box finally looks like:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | $ ssh root@1.1.1.2 Linux n1-box 4.20.0 #2 SMP PREEMPT Mon Dec 31 12:00:00 UTC 2018 aarch64 The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. Last login: Mon Dec 31 17:03:06 2018 from 1.1.1.1 [root@n1-box ~]# uname -a Linux n1-box 4.20.0 #2 SMP PREEMPT Mon Dec 31 12:00:00 UTC 2018 aarch64 GNU/Linux [root@n1-box ~]# neofetch _,met$$$$$gg. root@n1-box ,g$$$$$$$$$$$$$$$P. ----------- ,g$$P" """Y$$.". OS: Debian GNU/Linux 9 (stretch) aarch64 ,$$P' `$$$. Model: Phicomm N1 ',$$P ,ggs. `$$b: Kernel: 4.20.0 `d$$' ,$P"' . $$$ Uptime: 3 hours, 55 minutes $$P d$' , $$P Packages: 215 $$: $$. - ,d$$' Shell: bash 4.4.12 $$; Y$b._ _,d$P' CPU: (4) @ 1.5GHz Y$$. `.`"Y$$$$P"' Memory: 67MB / 1986MB `$$b "-.__ `Y$$ ████████████████████████ `Y$$. `$$b. `Y$$b. `"Y$b._ `""" |
It turns out to be quite easy.. Build the kernel Download the kernel source. DownloadContinue reading
Update: If you really care about the number of files in /boot, I suggest you read this post, which will allow you to remove emmc_autoscript as well. Only the followingContinue reading
The corresponding memory region was shrinked in DTB for 3.1x by this patch, and I changed the dtb I’m using accordingly.
1 2 3 4 5 6 7 8 9 10 11 | --- a.dts 2018-01-01 00:00:00.000000000 +0000 +++ b.dts 2018-01-01 00:00:00.000000000 +0000 @@ -167,7 +167,7 @@ hwrom@0 { no-map; - reg = < 0x00 0x00 0x00 0x1000000 >; + reg = < 0x00 0x00 0x00 0x100000 >; }; linux,cma { |
This change frees up 15M of memory. stress-ngContinue reading
fw_printenv / fw_setenv on Armbian 5.6x does not work out of box:
1 2 | # fw_printenv Cannot parse config file '/etc/fw_env.config': No such file or directory |
To solve this issue, put the following to /etc/fw_env.config:
1 2 | # Device to access offset env size /dev/mmcblk1 0x27400000 0x10000 |
IIRC Armbian 5.40- had this file inContinue reading
It looks that u-boot does not make the whole memory region visible to Linux kernel on my N1 box:
1 2 3 | # hexdump -C /sys/firmware/devicetree/base/memory@0/reg 00000000 00 00 00 00 00 00 00 00 00 00 00 00 78 00 00 00 |............x...| 00000010 |
Note the value 78 00 00 00 above, it meansContinue reading
Nothing tricky. Just replace all occurrance of bionic with cosmic in /etc/apt/sources.list and do a apt full-upgrade. For details, see Upgrading from Ubuntu 18.04. But what worth noting is thatContinue reading
Update: The patch mentioned in this post has been merged and I suppose it will be part of Linux 5.0. Phicomm N1’s dtb has also been merged into Linux 5.0.Continue reading