Re: [ptxdist] Crosscompile a WIFI USB stick firmware with ptxdist

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Dr. Patrick Langfeld,

On Thu, 27 Dec 2012 13:12:28 +0000, Dr. Patrick Langfeld wrote:

> My kernel is already configured with the wireless LAN components for 
> 80211 and the driver in Lan USB network adapter using the CARL9170, 
> which is the correct one for the DWA-160.
> 
> Now the hard part is to crosscompile the firmware carl9170-1.fw for the 
> USB network adapter. The sources can be found in a git repository
> https://github.com/chunkeey/carl9170fw.git

If you don't intend to do active development on this firmware, it's
probably easier to use a pre-built version of it, as available at
http://linuxwireless.org/en/users/Drivers/carl9170#Firmware_binary.

> and come with an autogen.sh script file, which I attached for you to 
> have a look at.
> 
> Now I am wondering HOW TO PROCEED and implement the build process of 
> autogen.sh in ptxdist and which package type is appropriate. Is it a 
> ./ptx newpackage target or a src-cmake-prog as the autogen.sh makes use 
> of cmake.
> In the readme file is written, that to build the firmware one would need 
> a SH-2 toolchain. Is this also true for cross-compilation? Do I really 
> need to build this toolchain first?

The firmware is the code that runs *inside* your Wifi chip, and
apparently this Wifi chip uses a SuperH 2 processor. So, regardless of
whether your embedded system uses a ARM processor, a x86 processor, or
something else, your USB Wifi device embeds a SH2 processor, and the
firmware is targeting this processor, not your main application
processor (ARM i.MX53 in your case).

So again, unless you need to make modifications to the firmware, I
would probably recommend to go with a pre-built version.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

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