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.weiss@ait.ac.atmailto:christoph.weiss@ait.ac.at | http://www.ait.ac.athttp://www.ait.ac.at/
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