High ping latency with iOS devices (iPad / iPhone)
pinging my iPad / iPhone shows an unreasonable high latency even if there’s no load on WiFi: # ping 1.1.1.2 PING 1.1.1.2 (1.1.1.2) 56(84) bytes of data. 64 bytes fromContinue reading
Phicomm N1 (seemingly) does not support booting from raw initramfs
Even if both the documentation (in source code) and the source code of boot_get_ramdisk suggest that booti (as well as other boot* family commands) support raw initrd image, my attemptContinue reading
Boot Phicomm N1 without emmc_autoscript / s905_autoscript
It’s recommended to backup your firmware environment variables before changing them. If fw_printenv / fw_setenv does not work on your device, you might want to checkout this post to fixContinue reading
Use ext4 for /boot partition on Phicomm N1
Be careful when doing this, I suggest you backup your data before reformatting your /boot as ext4. Any mistake you make would potentially require a reflash of your device (orContinue reading
Several patches I’m using for running Linux 5.0 on Phicomm N1
meson-text-offset.patch: Patch for moving TEXT_OFFSET. This is necessary for booting Linux on Meson SoCs. diff -uNr a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S — a/arch/arm64/kernel/head.S 2019-01-01 00:00:00.000000000 +0000 +++ b/arch/arm64/kernel/head.S 2019-01-01 00:00:00.000000000 +0000 @@ -52,7Continue reading
meson-gxl-s905d-phicomm-n1.dtb in Linux 5.0 won’t boot
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
update-initramfs fails to include fsck in initrd
update-initramfs reports the following warning when generating initrd.img: Warning: couldn’t identify filesystem type for fsck hook, ignoring. To identify filesystem type of /, update-initramfs requires device of / listed inContinue reading
Shutdown nginx on port 80
All requests to port 80 were made by those script kids. Have just shutdown nginx on that port.
Patch for compiling Linux for meson
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
Increase initcwnd on Debian
In case of high latency link, a too small initcwnd could degrade performance, as it may take a while for throughput to increase to its maximum. Increasing initcwnd could mitigateContinue reading