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PapaTutuWawa 2023-01-24 23:59:28 +01:00
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content/blog/2019-07-01-Mainline-Hero.md
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@ -23,7 +23,7 @@ from the device?
### Getting Output ### Getting Output
While preparing myself for this task, I learned that there are a couple of ways. While preparing myself for this task, I learned that there are a couple of ways.
One is called [*RAM console*](https://wiki.postmarketos.org/wiki/Mainlining_FAQ#Writing_dmesg_to_RAM_and_reading_it_out_after_reboot). What is does is just dump everything that the kernel prints into a One is called [*RAM console*](https://wiki.postmarketos.org/wiki/Mainlining_FAQ#Writing_dmesg_to_RAM_and_reading_it_out_after_reboot). What it does is just dump everything that the kernel prints into a
reserved region of memory, which can later be retrieved by reading from `/proc/last_kmsg` with a reserved region of memory, which can later be retrieved by reading from `/proc/last_kmsg` with a
downstream kernel. downstream kernel.
@ -94,7 +94,7 @@ the value `"Jig UART On"`:
The keyword `ADC_JIG_UART_ON` seems especially interesting. Why? Well, the driver has to know what to do The keyword `ADC_JIG_UART_ON` seems especially interesting. Why? Well, the driver has to know what to do
with each measured resistance. It would make sense that we call the constant which contains the resistance with each measured resistance. It would make sense that we call the constant which contains the resistance
something like that. Additionally, it is the only constant name name that does not immediately hint at its something like that. Additionally, it is the only constant name that does not immediately hint at its
value or function. value or function.
So we search the kernel source for this keyword. Most occurences are just So we search the kernel source for this keyword. Most occurences are just
@ -139,7 +139,7 @@ connect the phone's D- and D+ lines to the host USB's D- and D+. Hence the need
conversion for us and also deals with the timing of the data: The tiny board to which all cables lead to conversion for us and also deals with the timing of the data: The tiny board to which all cables lead to
basically just contains an *FT232RL* chip from *FTDI*. It is what does all the conversion and timing magic. basically just contains an *FT232RL* chip from *FTDI*. It is what does all the conversion and timing magic.
Since I don't want to accidentally brick by phone my frying it with 3.3V or 5V - though I think that damaging Since I don't want to accidentally brick by phone by frying it with 3.3V or 5V - though I think that damaging
the hardware with 5V is pretty difficult - I did not connect the USB's 5V to the *FT232*'s VCC port. the hardware with 5V is pretty difficult - I did not connect the USB's 5V to the *FT232*'s VCC port.
Booting up the device, we start to see data being sent via serial! Booting up the device, we start to see data being sent via serial!
@ -224,7 +224,7 @@ Device Tree files, the *S7* uses the Exynos 8890 SoC. This one is not in mainlin
required to port it from the [downstream kernel](https://github.com/ivanmeler/android_kernel_samsung_universal8890/) into mainline. required to port it from the [downstream kernel](https://github.com/ivanmeler/android_kernel_samsung_universal8890/) into mainline.
### Device Support ### Device Support
The challenge that follows, required I don't brick my phone, is the kernel support for the SoC's hardware. The challenge that follows, provided I don't brick my phone, is the kernel support for the SoC's hardware.
#### GPU #### GPU
The GPU of the Exynos 8890 SoC is a Mali-T880 from ARM. While there is no "official" FOSS-driver for it, one The GPU of the Exynos 8890 SoC is a Mali-T880 from ARM. While there is no "official" FOSS-driver for it, one

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