Re: [U-Boot] imx: Kernel not booting with fdt

3 Jul 2013


      Am 03.07.2013 03:16, schrieb Fabio Estevam:
...
On Tue, Jul 2, 2013 at 12:26 PM, Matthias Weißer weisserm@arcor.de wrote:
...
Hi
I try to boot a current 3.11 kernel on a custom iMX25 board using DT. u-boot
starts the kernel but it stops working just after the first eralyprintk
lines are out. The u-boot/kernel output:
bootm 0x81000000 - 0x80800000
## Booting kernel from Legacy Image at 81000000 ...
   Image Name:   Linux-3.10.0
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    3834336 Bytes = 3.7 MiB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 80800000
   Booting using the fdt blob at 0x80800000
   Loading Kernel Image ... OK
OK
   Loading Device Tree to 8374f000, end 837545d4 ... OK
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 3.10.0 (mweisser@ubuntu) (gcc version 4.7.3
(Ubuntu/Linaro 4.7.3-1ubuntu1) ) #4 Tue Jul 2 1
7:13:13 CEST 2013
[    0.000000] CPU: ARM926EJ-S [41069264] revision 4 (ARMv5TEJ), cr=00053177
[    0.000000] CPU: VIVT data cache, VIVT instruction cache
[    0.000000] Machine: Generic DT based system, model: Graf-Syteco zmx25
Not sure why you get a "Generic DT based system" here.
Isn't that supossed to be the right output for a DT kernel?
...
Can you post your dts file?
Sure. It is based on imx25-pdk.dts minus nand plus uart2 which is used 
as debug uart on the system in question.
/dts-v1/;
#include "imx25.dtsi"
/ {
    model = "Graf-Syteco zmx25";
    compatible = "fsl,zmx25", "fsl,zmx25";
memory {
    	reg = <0x80000000 0x4000000>;
    };
};
&uart1 {
    status = "okay";
};
&uart2 {
     status = "okay";
};
&fec {
    phy-mode = "rmii";
    status = "okay";
};
...
Have you selected CONFIG_MACH_IMX25_DT=y on your kernel config file?
$ cat .config | grep CONFIG_MACH_IMX25_DT
CONFIG_MACH_IMX25_DT=y
Confirmed.
...
Also, make sure you have "#define CONFIG_OF_LIBFDT" on your U-boot
board config file.
$ cat include/configs/zmx25.h | grep CONFIG_OF_LIBFDT
#define CONFIG_OF_LIBFDT
Confirmed.
As the kernel is not crashing but hanging in an endless loop I will try 
if I can get some additional information via the JTAG debugger.
Regards
Matthias