Re: [linux-sunxi] Re: Mainlining Linux Sunxi SoC AW USB

Peter,

On Sat, 24 Jul 2021 at 15:22, Petr Vorel [off-list ref] wrote:

Hi Greg,

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On Sat, Jul 24, 2021 at 03:41:42PM +0200, Petr Vorel wrote:

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Why is this even a driver at all, it looks like you can write a small
userspace program using libusb to do everything it does, right?  What
exactly is this driver needed for?

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I'm sorry for not providing more info at the beginning. This is a driver for
host computer (i.e. developers laptop) used by LiveSuit tool [2] to flash Images
to the NAND of Allwinner devices. LiveSuit itself [3] is unfortunately provided
only in binary form. The only open source code with GPL v2 license is awusb
driver. Thus I thought I could ease my life with upstreaming at least the
kernel driver. But maybe it's not a good idea. I'm using LiveSuit for flashing
Allwinner A31, but it requires quite old distro due libqtgui4. Maybe sunxi folks
use something newer nowadays, but I haven't found anything in their wiki.

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Ah, that's not going to be good then.  Really, this doesn't seem to need
to be a driver at all, and the ioctls are really strange so we would
need to change them anyway before it could be merged.  But with no
access to userspace code, that will be quite difficult, so I would push
back on allwinner and have them work on resolving this.

Understand, it makes sense. Thanks for your time!

@Sunxi community: am I missing something? Using LiveSuit with old distro chroot
and Xephyr with out-of-tree module isn't fun :(.

Suggest you take a look at sunxi-tools - specifically the sunxi-fel
tool. This is a libusb-based userland tool to talk to these devices.
I'm not sure if it supports flashing to nand on A31 - never tried it -
but have used it to flash to eMMC and SPI flash on their other chips.

hth,
Chris

Kind regards,
Petr

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thanks,

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greg k-h

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