-EMAINLINE

What is this?

A place where I document my attempts at porting the mainline Linux kernel to various mobile devices, from writing device trees to writing device drivers.

Why is it called -EMAINLINE?

[   0.119556] simple-blog 5f24b080.blog: Failed to find a better name: -EMAINLINE
[   0.120357] simple-blog: probe of 5f24b080.blog failed with error -EMAINLINE

Jokes aside, minus error codes such as -EINVAL, -ETIMEOUT and -EPROBE_DEFER are something dealt with regularly when working with Linux, and from there comes the name of this blog: -EMAINLINE.

What do you work on?

Devices and SoCs I work on:

Xiaomi Mi Note 2

Qualcomm Snapdragon 821 (MSM8996 Pro)

I work on this device the most, thanks to the good initial mainline support for the MSM8996 SoC.

Samsung Galaxy Grand Prime+

MediaTek MT6737T

This device has a broken ARM Trusted Firmware implementation that makes it impossible to boot a 64-bit OS despite having ARMv8 CPUs. It also lacks PSCI, so booting the remaining 3 CPUs is not possible without a special driver. That is perhaps made clear by the single Tux showing up:

Lenovo IdeaTab A3000

MediaTek MT6589

This is an old SoC with 4x ARM Cortex-A7 CPUs and a PowerVR SGX544 GPU, which unfortunately has no open source driver.