Linux/BEAGLEBK: Beaglebone Black peripheral boot USB0

Matt Tsai52

Intellectual 865 points

Part Number: BEAGLEBK

Tool/software: Linux

Hi,

I tried to build Beaglebone Black images for booting from USB0 but without success.

The following are what I did:

1.Build the images using Yocto build system from:

Tag "rocko-18.0.3" from git://git.yoctoproject.org/poky

Tag "ti2018.03" from git://git.yoctoproject.org/meta-ti

MACHINE = "am335x-evm"

2. Default u-boot configuration is used (am335x_boneblack_defconfig).

3. Following this instruction http://processors.wiki.ti.com/index.php/Sitara_Linux_Program_the_eMMC_on_Beaglebone_Black#Preparing_the_Flasher_Image, the resulting u-boot.img and u-boot-spl.bin are renamed into u-boot-restore.img and u-boot-spl-restore.bin, respectively. Then placed them under the Uniflash TFTP home folder: C:\AM335x_Flashtool\images.

Below are the messages from the serial console:

U-Boot SPL 2018.01-g8b2f1df4b5 (Jan 10 2019 - 18:54:12)

Trying to boot from USB eth

** Bad device mmc 0 **

Using default environment

<ethaddr> not set. Validating first E-fuse MAC

cpsw, usb_ether

Error: usb_ether address not set.

using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in

MAC c8:df:84:da:88:91

HOST MAC de:ad:be:ef:00:00

RNDIS ready

musb-hdrc: peripheral reset irq lost!

cpsw Waiting for PHY auto negotiation to complete......... TIMEOUT !

Problem booting with BOOTP

SPL: failed to boot from all boot devices

### ERROR ### Please RESET the board ###

Below are the questions I have:

1. What did I miss? I suspect instead of using default u-boot configuration, some of the u-boot configuration needs be modified for peripheral boot from USB0 to work. If yes, what need to be modified? If not, can someone point out what may cause these errors?

2. I noticed that Uniflash does not work on a computer that has an additional network card. I need to use a computer that has only one Ethernet port for it to work. I wonder if this is a known problem? Using Wireshark, I saw BOOTP requests sending out from the Beaglebone on the Linux USB Ethernet/RNDIS Gadget interface. However, the replies from the host PC are not seen. Is there a way to make it work?

Please help. Thank you!

over 5 years ago

0 RonB over 5 years ago

TI__Mastermind 30276 points

Matt,

The default am335x-evm-defconfig should work with the Beaglebone Black for peripheral boot. I would suggest trying the prebuilt images from the SDK as I have verified those work on recent SDKs (5.x).

Matt Tsai52 said:
2. I noticed that Uniflash does not work on a computer that has an additional network card. I need to use a computer that has only one Ethernet port for it to work. I wonder if this is a known problem? Using Wireshark, I saw BOOTP requests sending out from the Beaglebone on the Linux USB Ethernet/RNDIS Gadget interface. However, the replies from the host PC are not seen. Is there a way to make it work?

I don't know of this limitation. Have you verified that the USB port is properly set up and has an assigned IP Address? I believe the servers bind to the IP Address, not necessarily the port. In fact, I've used Uniflash to flash multiple boards over USB, which end up looking like multiple interfaces. So, I'm fairly certain this is a configuration issue and not a hard limitation.

I hope this helps you.

0 Matt Tsai52 over 5 years ago in reply to RonB

Intellectual 865 points

Hi Ron,

1. Like I mentioned, I build the images from meta-ti and poky. SDK will be another build system for me. Would you please advise where I can download the SDK and instruction to start the build?

Thank you.

0 Matt Tsai52 over 5 years ago in reply to Matt Tsai52

Intellectual 865 points

Hi Ron,
Although I am using a fairly new meta-ti, which I assume am335x_evm_defconfig should contains what is necessary for peripheral boot from USB0. It will be great if you can provide am335x_evm_usbspl_defconfig so that I can double check with my am335x_evm_defconfig. I will try more with my current images.

Thank you for your help.

0 RonB over 5 years ago in reply to Matt Tsai52

TI__Mastermind 30276 points

Matt,

Here is a link to the defconfig for TI U-Boot:

http://git.ti.com/ti-u-boot/ti-u-boot/blobs/master/configs/am335x_evm_defconfig

You can download the pre-builts to give them a try without getting the whole SDK:

http://software-dl.ti.com/processor-sdk-linux/esd/AM335X/latest/exports/am335x-evm-linux-sdk-bin-05.02.00.10.tar.xz

Our Getting Started Guide is here:

http://software-dl.ti.com/processor-sdk-linux/esd/docs/05_02_00_10/linux/Overview_Getting_Started_Guide.html

I hope this provides what you need.

0 Matt Tsai52 over 5 years ago in reply to RonB

Intellectual 865 points

Ron,
Thank you. I believe this help.

However, when I started trying the TI pre-built images. After I press S2 and plug in the USB cable, Windows 10 always detects "USB serial port" in Device Manager, not "Other Devices". I tried uninstalling the drivers and power cycle the device, Windows 10 still detects "USB serial port". What needs to be done to make Windows 10 Device Manager displaying "Other Devices", or "Linux USB Ethernet/RNDIS Gadget"?

Thank you.

0 RonB over 5 years ago in reply to Matt Tsai52

TI__Mastermind 30276 points

Matt,

I've heard of issues with Windows 10 and RNDIS drivers. Unfortunately, I can't really help with a solution. I have had some people tell me they got it to work after finding the right RNDIS drivers from Microsoft for Windows 10. That may be part of the problem.

0 Matt Tsai52 over 5 years ago in reply to RonB

Intellectual 865 points

Hi Ron,

I had some luck with a Windows 7 system. Now I am able to load the bootloaders from Uniflash. Also, following the same instruction, I am able to boot a Linux kernel with an initramfs based on the core-image-minimal.

The issue now is the USB Ethernet Gadget does not work at Linux level. I have followed the same instruction to modify kernel configuration. But usb0 does not show in the ifconfig output.

Question:
What else needs to be modified to bring up usb0 when the system boots? Options in the u-boot kernel command line parameters? The network/interfaces file in Linux? Or some other setup scripts or missing kernel configurations?

Please help. Thank you!

0 Matt Tsai52 over 5 years ago in reply to Matt Tsai52

Intellectual 865 points

Hi Ron,
I think I found the problem. The physical layer drivers were not included. It works after I added the drivers in the kernel image.

Thank you for your support.

0 RonB over 5 years ago in reply to Matt Tsai52

TI__Mastermind 30276 points

Matt,

Thanks for sharing your solution. I'm sorry I didn't provide it in time, but for anyone that finds this thread later, here is a good page that talks about what is needed to build MUSB into the kernel:

processors.wiki.ti.com/.../MUSB_Linux_Driver_Configuration

Good luck with the rest of your design.

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Linux/BEAGLEBK: Beaglebone Black peripheral boot USB0