Re: [PATCH v2 0/2] usb: gadget: Fix g_ncm regression and atomic sleep in f_ncm

[David Heidelberg <david@ixit.cz>]

On 02/03/2026 16:41, David Heidelberg wrote:
> On 02/03/2026 11:15, Kuen-Han Tsai wrote:
> [...]>
>> David, could you share exactly what OS you are using (e.g.,
>> postmarketOS with an sdm845/6.18-dev tree)? Also, could you provide
>> some instructions on how to build the code and reproduce this problem
>> on a Pixel 3? If you have the time, it would be incredibly helpful if
>> you could dive into this a bit deeper on your device to see exactly
>> how the DHCP daemon is failing.
> 
> Hello Kuen-Han,
> 
> it's pmOS initrd, but generally I got reported same behaviour on Mobian (Mobile 
> Debian) too.
> 
> The Pixel 3 support was merged, so it can be reproduced with:
> 1. 7.0-rc1 tag
> 2. -next tree (latest tested is next-20260227)
> 3. our sdm845-next tree [1] (some WIP patches, working touchscreen on Pixel 3, 
> etc.), the tree currently contains the reverts

I forgot to mention, the build is just (considering option 3., which includes 
sdm845.config fragment):

make defconfig sdm845.config
make
mkbootimg (with params seen below)

deviceinfo_flash_offset_base="0x00000000"
deviceinfo_flash_offset_kernel="0x00008000"
deviceinfo_flash_offset_ramdisk="0x01000000"
deviceinfo_flash_offset_second="0x00000000"
deviceinfo_flash_offset_tags="0x00000100"

You can use Luca's [1] scripts for the processing kernel to be suitable for 
fastboot (appends initrd to boot.img) and uploading kernel modules to pmOS rootfs.

Options 1. and 2. won't work directly with fastboot, as chainloaded u-boot is 
needed due to fastboot requiring some ancient kernel offset to be in place (we 
keep patch to workaround it in sdm845-next).

David

[1] https://github.com/z3ntu/linux-mainline-scripts/

> 
> I can provide log with the patch [2], without the patch [3] (well, it's more 
> like nothing is in the log)
> 
> I'm very lightly familiar with usb subsystem, so if you give me hints what to 
> look for (or what to debug), I'll try find a moment to check to move this forward.
> 
> Thank you for working on improving usb gadgets!
> David
> 
> [1] https://codeberg.org/sdm845/linux/
> [2] https://paste.sr.ht/~okias/35982d7e284ee0f767e57923ced591beb4d3b238#L589
> [3] https://paste.sr.ht/~okias/4e9172a34e4093445536b51e935dbd229edad7b2#L613

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