Dear all,
I am trying to get my own build of U-Boot to boot Linux on a Jetson TK1 board.
As we are pushing for verified boot I am using the Flat Image Tree (unifying
kernel image, device tree blob, ...) to describe my system. U-Boot can load the
ITB file and tries to start the kernel but the system hangs after this message.
I assume that this is because no boot arguments are passed to the kernel (the
original startup adds loads of arguments) but I am a little dumbfounded on how
to pass the arguments to the kernel. I tried setting the bootargs environment
variable but this did not change the situation.
How do I pass kernel arguments to the kernel when using an ITB file?
Command line arguments (taken from the APPEND command of the examples
extlinux.conf):
console=ttyS0,115200n8 console=tty1 no_console_suspend=1
lp0_vec=2064@0xf46ff000 video=tegrafb mem=1862M@2048M memtype=255
ddr_die=2048M@2048M
section=256M pmuboard=0x0177:0x0000:0x02:0x43:0x00 vpr=151M@3945M
tsec=32M@3913M
otf_key=c75e5bb91eb3bd947560357b64422f85 usbcore.old_scheme_first=1
core_edp_mv=1150
core_edp_ma=4000 tegraid=40.1.1.0.0 debug_uartport=lsport,3
power_supply=Adapter
audio_codec=rt5640 modem_id=0 android.kerneltype=normal
usb_port_owner_info=0
fbcon=map:1 commchip_id=0 usb_port_owner_info=0 lane_owner_info=6
emc_max_dvfs=0
touch_id=0@0 tegra_fbmem=32899072@0xad012000
board_info=0x0177:0x0000:0x02:0x43:0x00
root=/dev/mmcblk0p1 rw rootwait tegraboot=sdmmc gpt
Content of ITS file:
/dts-v1/;
/ {
description = "Simple image with single Linux kernel and FDT
blob";
#address-cells = <1>;
images {
kernel@1 {
description = "Vanilla Linux
kernel";
data = /incbin/("./zImage");
type = "kernel";
arch = "arm";
os = "linux";
compression = "none";
load = <0x81008000>;
entry = <0x81008000>;
hash@1 {
algo = "crc32";
};
hash@2 {
algo = "sha1";
};
};
fdt@1 {
description = "Flattened Device
Tree blob";
data =
/incbin/("./tegra124-pm375.dtb");
type = "flat_dt";
arch = "arm";
compression = "none";
hash@1 {
algo = "crc32";
};
hash@2 {
algo = "sha1";
};
};
};
configurations {
default = "conf@1";
conf@1 {
description = "Boot Linux kernel
with FDT blob";
kernel = "kernel@1";
fdt = "fdt@1";
};
};
};
U-Boot Output:
Tegra124 (Jetson TK1) # fatload mmc 1 0x90000000 /kernel_fdt.itb
reading /kernel_fdt.itb
5946200 bytes read in 497 ms (11.4 MiB/s)
Tegra124 (Jetson TK1) # bootm 0x90000000
## Loading kernel from FIT Image at 90000000 ...
Using 'conf@1' configuration
Verifying Hash Integrity ... OK
Trying 'kernel@1' kernel subimage
Description: Vanilla Linux kernel
Type: Kernel Image
Compression: uncompressed
Data Start: 0x900000ec
Data Size: 5910168 Bytes = 5.6 MiB
Architecture: ARM
OS: Linux
Load Address: 0x00000000
Entry Point: 0x00000000
Hash algo: crc32
Hash value: c5b4b377
Hash algo: sha1
Hash value: f001007efe83f563425bfe0659186a32395c946c
Verifying Hash Integrity ... crc32+ sha1+ OK
## Loading fdt from FIT Image at 90000000 ...
Using 'conf@1' configuration
Trying 'fdt@1' fdt subimage
Description: Flattened Device Tree blob
Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x905a30ac
Data Size: 34678 Bytes = 33.9 KiB
Architecture: ARM
Hash algo: crc32
Hash value: e466b23e
Hash algo: sha1
Hash value: ec909ae16e62233d0ed1e1f4c909085abc9b5879
Verifying Hash Integrity ... crc32+ sha1+ OK
Booting using the fdt blob at 0x905a30ac
Loading Kernel Image ... OK
Using Device Tree in place at 905a30ac, end 905ae821
Starting kernel ...
Thanks in advance,
Best regards
CHRISTOPH WEISS
Engineer
Safety & Security Department
Video and Security Technology
AIT Austrian Institute of Technology GmbH
Donau-City-Straße 1 | 1220 Vienna | Austria
T +43 50550-4179 | M +43 664 883906749
christoph.we...@ait.ac.at<mailto:christoph.we...@ait.ac.at> |
http://www.ait.ac.at<http://www.ait.ac.at/>
FN: 115980 i HG Wien | UID: ATU14703506
www.ait.ac.at/Email-Disclaimer<http://www.ait.ac.at/Email-Disclaimer>
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