Project Description

Qualcomm concentrate on supporting recent SOC, older ones aren't supported (use very old downstream kernel, e.g. 3.10).

Goal for this Hackweek

1. Boot mainline kernel to initramfs

I managed to boot mainline kernel (5.9.0-rc1 at the time) on msm89xx on my phone, but kernel crashes. Find why.

$ fastboot -c "debug ignoreloglevel earlycon" boot boot.img [74500] Continuous splash enabled, keeping panel alive. [74500] booting linux @ 0x80000, ramdisk @ 0x2700000 (1236022), tags/device tree @ 0x2500000 [74510] Jumping to kernel via monitor [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd032] [ 0.000000] Linux version 5.9.0-rc1-00020-gabea2a011c54 (pmos@localhost) (aarch64-alpine-linux-musl-gcc (Alpine 10.2.0) 10.2.0, GNU ld (GNU Binutils) 2.35.1) #3 SMP PREEMPT Tue Oct 6 12:24:55 UTC 2020 [ 0.000000] printk: debug: ignoring loglevel setting. [ 0.000000] efi: UEFI not found. [ 0.000000] [Firmware Bug]: Kernel image misaligned at boot, please fix your bootloader! [ 0.000000] cma: Reserved 32 MiB at 0x00000000de000000 [ 0.000000] earlycon: msmserialdm0 at MMIO 0x00000000f991e000 (options '115200n8') [ 0.000000] printk: bootconsole [msmserialdm0] enabled ... [ 0.185155] pinctrl core: initialized pinctrl subsystem [ 0.191761] DMI not present or invalid. [ 0.196193] NET: Registered protocol family 16 [ 0.200769] DMA: preallocated 4096 KiB GFPKERNEL pool for atomic allocations [ 0.204611] DMA: preallocated 4096 KiB GFPKERNEL|GFPDMA pool for atomic allocations [ 0.211812] DMA: preallocated 4096 KiB GFPKERNEL|GFPDMA32 pool for atomic allocations [ 0.218962] audit: initializing netlink subsys (disabled) [ 0.228072] thermalsys: Registered thermal governor 'stepwise' [ 0.228076] thermalsys: Registered thermal governor 'powerallocator' [ 0.232293] audit: type=2000 audit(0.144:1): state=initialized auditenabled=0 res=1 [ 0.244954] cpuidle: using governor menu [ 0.253102] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers. [ 0.256526] ASID allocator initialised with 32768 entries [ 0.264698] Serial: AMBA PL011 UART driver ... RESET AND DOWNSTREAM KERNEL continues :( D - 15524 - pmdriver_init, Delta

2. Explore current Qualcomm mainlining kernel effort

Resources

• https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git
• https://wiki.postmarketos.org/wiki/Mainlining
• https://wiki.postmarketos.org/wiki/Mainlining_Guide

Results

• https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?h=for-next&id=f890f89d9a80fffbfa7ca791b78927e5b8aba869
• https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?h=for-next&id=9d1fc2e4f5a94a492c7dd1ca577c66fdb7571c84
• https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?h=for-next&id=3cb6a271f4b04f11270111638c24fa5c0b846dec
• https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?h=for-next&id=0e5ded926f2a0f8b57dfa7f0d69a30767e1ea2ce