[Letux-kernel] Modern LetuxOS Kernels for old v4.2 Replicant

H. Nikolaus Schaller hns at goldelico.com
Thu Jul 11 12:12:45 CEST 2019

> Am 11.07.2019 um 09:38 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> Hi,
> after having the build infrastructure improved, I am trying to make
> the newer kernels work with the old 4.2 replicant image.
> letux-4.14.133-replicant is booting partially, shows "ANDROID" but
> then some processes fail to run. This likely has to do something
> with the sensors.
> Next I tried the letux-4.19.58-replicant. This fails with 
> [   24.041822] binder: 2566:2566 ioctl c0186201 be9b7ad8 returned -22
> [   24.049750] init: critical process 'servicemanager' exited 4 times in 4 minutes; rebooting into recovery mode
> /dev/binder exists but it turned out that the old 32 bit binder
> protocol required for versions v4.4 and older has been removed in
> linux v4.18. Therefore the binder kernel driver does no longer
> understand the old binder protocol (CONFIG_ANDROID_BINDER_IPC_32BIT)
> and we therefore have no binary compatibility.
> What to do? I can try to revert the removal of CONFIG_ANDROID_BINDER_IPC_32BIT.
> But there is another issue: it appears that newer Android releases
> can not properly handle CONFIG_ANDROID_BINDER_IPC_32BIT=y.
> From the Kconfig documentation:
> 	Enable this to support an old 32-bit Android user-space (v4.4 and earlier).
> 	Note that enabling this will break newer Android user-space.
> So we may end up in two different kernel builds for older and
> newer Replicant... Which is not the type of unification we are
> fighting for.
> In fact kernel maintainers have a different view on this topic:
> 	https://lkml.org/lkml/2018/5/11/119

With this patch reverted, I could start replicant-4.2 + letux-4.19.58-replicant on GTA04A5.

replicant-4.2 + letux-5.2+letux/android did not start the kernel :(


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