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List:       linux-backports
Subject:    Problem backporting wl18xx to kernel 2.6.28
From:       Guillaume Fournier <gfournier () brioconcept ! com>
Date:       2016-05-03 16:14:39
Message-ID: CY1PR0401MB0972873AA01C262A18881EA0BA7A0 () CY1PR0401MB0972 ! namprd04 ! prod ! outlook ! com
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Hello,

I am trying to use backports-3.14.22-1 to cross-compile the wl18xx driver for a \
custom kernel 2.6.28 designed to run on an NXP video encoder (ASC8852A).  I am using \
Backports 3.14 because of this note in the documentation: "Current versions of \
backports support all mainline kernels starting with version 3.0, for kernel versions \
older than 3.0 please use backports-3.14, which supports all kernel versions back to \
2.6.26.".  I have decided to using 3.14.22 because it seemed the most recent 3.14 \
release.  While configuring Backports, I noticed that the TI Modules (WL_TI) were not \
supported prior to 2.6.30:

Symbol: WL18XX [=m]
Type : tristate
Prompt: TI wl18xx support
  Defined at drivers/net/wireless/ti/wl18xx/Kconfig:1
  Depends on: WLAN [=y] && WL_TI [=y] && m && <choice> && MAC80211 [=m]
  Location:
    -> Wireless LAN (WLAN [=y])
      -> TI Wireless LAN support (WL_TI [=y])
  Selects: WLCORE [=m]

and

Symbol: WL_TI [=y]
Type : boolean
Prompt: TI Wireless LAN support
  Defined at drivers/net/wireless/ti/Kconfig:1
  Depends on: WLAN [=y] && !BACKPORT_KERNEL_2_6_30
  Location:
    -> Wireless LAN (WLAN [=y])

Therefore, I am trying to get the wl18xx to build on 2.6.30 as a first step.  After I \
get this to work, I will try to manually backport it to 2.6.28.  I will have to find \
out how to get the patched driver source code for the 2.6.30 driver (maybe use the \
Backports kernel integration?), but first things first.

To make things easier for Backports, I am *not* using my custom kernel for now but a \
clean slate 2.6.30 kernel.  Here is what I did: 1) Cloned linux from \
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2) Checked out \
v2.6.30 3) Menuconfig to make sure CONFIG_CRYPTO_CCM=m is activated as per: \
http://marc.info/?t=139876444500003&r=1&w=2 (it was already activated so I had \
nothing to do except saving the config) 4) Cross-compiled the kernel
5) Menuconfig Backports to select wl18xx driver, cfg80211, mac80211
6) Cross-compile Backports

All this is run in a VirtualBox VM running Ubuntu 16.04 LTS 32 bits.  Here are my \
environment variables of interest: \
CROSS_COMPILE=/opt/Mozart_toolchain/arm-eabi-uclibc/usr/bin/arm-unknown-linux-uclibcgnueabi- \
(from NXP SDK toolchain) ARCH=arm
KLIB_BUILD=/home/gfournier/wifi-atomas/linux (points to the clean slate cloned linux \
kernel 2.6.30) KLIB=/home/gfournier/wifi-atomas/rootfs (empty rootfs directory to get \
the result of the build)

I am running into build errors.  First, I got this error (although \
CONFIG_CRYPTO_CCM=m): In file included from \
                /home/gfournier/wifi-atomas/backports-3.14.22-1/compat/compat-2.6.32.c:11:
                
/home/gfournier/wifi-atomas/backports-3.14.22-1/backport-include/linux/compat.h:18: \
error: expected ';', ',' or ')' before '*' token

I commented out the code as such to see if I would get better results:
#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
//#define compat_put_timespec LINUX_BACKPORT(compat_put_timespec)
//extern int compat_put_timespec(const struct timespec *, void __user *);
#endif

However, I now have this error:
/home/gfournier/wifi-atomas/backports-3.14.22-1/drivers/net/wireless/ti/wl18xx/scan.c: \
                In function 'wl18xx_scan_send':
/home/gfournier/wifi-atomas/backports-3.14.22-1/drivers/net/wireless/ti/wl18xx/scan.c:138: \
                error: unknown field 'enabled' specified in initializer
/home/gfournier/wifi-atomas/backports-3.14.22-1/drivers/net/wireless/ti/wl18xx/scan.c:138: \
                warning: excess elements in struct initializer
/home/gfournier/wifi-atomas/backports-3.14.22-1/drivers/net/wireless/ti/wl18xx/scan.c:138: \
warning: (near initialization for 'descriptor')

Is there something I am not understanding correctly about how I am supposed to build \
Backports? Can you provide help on the previous errors?
To your knowledge, has anyone tried to get wl18xx running on 2.6.28?

Guillaume Fournier

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