dear marcel
i did following steps according to your above link, to solve driver make problem
1-sudo su
1.git clone -b toradex_tk1_l4t_r21.7 git://git.toradex.com/linux-toradex.git
2.apt-get update
3.apt-get install u-boot-tools
4.cd linux-toradex
5.ake apalis-tk1_defconfig
6.make -j6
7.make -j6 zImage
but i get this error ofter step 7
drivers/video/tegra/dc/of_dc.c:260:2: error :'for' initial declarations are only allowed in c99 mode
for(int i=0;i<5;i++){
drivers/video/tegra/dc/of_dc.c:260:2: note:use option -std=c99 or -std=gnu99 to compile your code
i think i should change makefile but i dont know the location of adding option (-std=c99) to makefile
thank you