question about boot kernel from ftfp

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

Hi, we try to test boot from tftp, but it always failed to download boot.img, no matter we
used linux tftpd or windows tftpd, the below is the log.

0009.525] I> tegrabl_get_boot_img_load_addr(): 1339, boot image load addr: 0xa43b0000
[0009.525] TFTP Client: Init
[0009.527] TFTP Client: Server IP: 192.168.0.1
[0009.531] TFTP Client: Send RRQ, file: tegra194-p2888-0001-p2822-0000.dtb
[0014.539] TFTP Client: Connection failed
[0014.549] TFTP Client: Send RRQ, file: tegra194-p2888-0001-p2822-0000.dtb

[0015.570] TFTP Client: Last packet received
[0015.571] I> Authenticate tftp downloaded tegra194-p2888-0001-p2822-0000.dtb, size 0x400000
[0015.571] I> >>pega TEGRABL_BINARY_KERNEL_DTB line=319
[0015.572] I> T19x: Authenticate tegra194-p2888-0001-p2822-0000.dtb (bin_type: 38), max size 0x400000
[0015.578] TFTP Client: Send RRQ, file: boot.img
#############################[0029.569] TFTP Client: Error received: code: 0, msg: Not defined
[0029.570] E> Failed to get boot.img
[0029.571] I> netif status changed 192.168.0.2
[0029.571] E> Error (1282) network load failed for kernel & kernel-dtb

2

Hi boyi_liao,

Please check below topic if can help:
[url]https://devtalk.nvidia.com/default/topic/1049635/jetson-agx-xavier/cboot-modify-code-to-boot-unsigned-boot-img-and-dtb-file/post/5333600/#5333600[/url]

Thanks

3

Hi kaycc:

I used boot_sigheader.img.encrypt and tegra194-p2888-0001-p2822-0000_sigheader.dtb.encrypt for tftp
boot, but i found it will download boot.img and tegra194-p2888-0001-p2822-0000.dtb file name.

I just modify the file name, the files are signed and encrypted, but when download boot.img, it always failed. Is this a bug ?

4

boyi_liao,

Could you share your whole setup for tftp boot?

5

Hi WayneWWW:

Do you mean cbo.dts setting ?

patrick@patrick-X541UV:~/MHT/Linux_for_Tegra/bootloader$ cat cbo.dts
/*

  • Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
  • NVIDIA CORPORATION and its licensors retain all intellectual property
  • and proprietary rights in and to this software, related documentation
  • and any modifications thereto. Any use, reproduction, disclosure or
  • distribution of this software and related documentation without an express
  • license agreement from NVIDIA CORPORATION is strictly prohibited.
    */

/dts-v1/;

	/*boot-order = "sd", "usb", "emmc", "net";*/

/ {
compatible = “nvidia,cboot-options-v1”;
boot-configuration {
boot-order = “net”, “usb”, “emmc”, “sd”;
tftp-server-ip = /bits/ 8 <192 168 0 1>;
/dhcp-enabled;/
/* remove dhcp-enabled if uncommenting static-ip configuration */
static-ip = /bits/ 8 <192 168 0 2>;
ip-netmask = /bits/ 8 <255 255 255 0>;
ip-gateway = /bits/ 8 <192 168 0 1>;

};

};

6

Hi boy_liao,

Are you sure the ethernet connection has no problem?

[0009.527] TFTP Client: Server IP: 192.168.0.1
[0009.531] TFTP Client: Send RRQ, file: tegra194-p2888-0001-p2822-0000.dtb
[0014.539] TFTP Client: Connection failed

7

Hi WayneWWW:

yes, because the second time, it download success, you can see the log

[0014.549] TFTP Client: Send RRQ, file: tegra194-p2888-0001-p2822-0000.dtb

But when it downloads system.img half of it will fail.

8

Hi WayneWWW:

In tftp boot, what files should we put on tftp server ? “boot.img”/“tegra194-p2888-0001-p2822-0000.dtb” or boot_sigheader.img.encrypt"/“tegra194-p2888-0001-p2822-0000_sigheader.dtb.encrypt” ?

9

Hi boyi_liao,

Please use signed files, copy signed bins only otherwise it will result in authentication failure.

10

I trace the code and print the message, in tftp_client.c recv() function, i found it will fail in this condition.
Did it work on your side ?

if (blk_num != tftp_client.exptd_blk) {
#if TFTP_CLIENT_DEBUG && !PROGRESS_BAR
LWIP_DEBUGF(TFTP_DEBUG | LWIP_DBG_STATE,
(“Rcvd blk no: %u != expected blk no: %u\n”, blk_num, tftp_client.exptd_blk));
#endif

        goto fail;

}

11

Hi boyi_liao,

We can success boot from Ethernet on r32.1/Xavier.
Please check below setting:

  1. TFTP server is working on your host machine? (try to get file to confirm the function)
  2. The kernel and kernel-dtb files are using signed bins and rename to boot.img and tegra194-p2888-0001-p2822-0000.dtb
  3. Restart the xinetd service:
$ sudo service xinetd restart
  1. The tftp-server-ip is correct in cbo.dts
12

Hi,

We can success boot from tftp, but downloading speed very slow, sometimes it will fail.

BR,
Patrick