USB Device Boot Arguments

Naven

Intellectual 750 points

Hi team,

am try to usb flashing in my coustem board,so my usb device partition in to boot and rootfs same like sd card,

but my problem when booting my board not responding .

my board no emcc and sd card plan to flashing directly usb device .any changes in boot arguments

uEnv.txt :

bootpart=0:2
mmcroot=/dev/sda2
console=ttyO1,115200n8
fdtfile=am335x-boneblack.dtb

Regards,

Naveen

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Naveen,

Do you intend to boot only kernel and filesystem from USB, or you want to boot entirely from USB?

0 Naven over 10 years ago in reply to Biser Gatchev-XID

Intellectual 750 points

Hi sir,

I want boot entirely from USB only please let me know the process .

Regards,
Naven

0 Biser Gatchev-XID over 10 years ago in reply to Naven

TI__Guru**** 393215 points

Read section 26.1.8.6 from the AM335X TRM Rev. L. Additionally this wiki may help: http://processors.wiki.ti.com/index.php/Linux_Core_U-Boot_User's_Guide#Using_the_network_.28Wired_or_USB_Client.29

Please note that booting from USB Flash Drive (AM335X USB in Host mode) is not supported.

0 Naven over 10 years ago in reply to Biser Gatchev-XID

Intellectual 750 points

Thank you for your reply, I am trying to boot flash through USB0(OTG client mode only). I want boot all files through USB0 only like MLO, uboot.img and zImage....

0 Biser Gatchev-XID over 10 years ago in reply to Naven

TI__Guru**** 393215 points

The AM335X ROM code implements as RNDIS class driver, so the USB port enumerates as an ethernet port on your Host PC. From there on it's just like boot over Ethernet. You will need to configure the server as described in the wiki above and send the files to your board.

0 Biser Gatchev-XID over 10 years ago in reply to Biser Gatchev-XID

TI__Guru**** 393215 points

Also make sure you aren't affected by the silicon Errata. For USB Boot Errata 1.0.20 applies to silicon revision 1.0.

0 Naven over 10 years ago in reply to Biser Gatchev-XID

Intellectual 750 points

I am using usb pen drive stick for booting files in OTG mode(usb pen drive client mode),like sd card. how boot ROM code detect USB pen drive stick.

0 Biser Gatchev-XID over 10 years ago in reply to Naven

TI__Guru**** 393215 points

I already explained clearly that AM335X ROM code cannot boot from USB pen drive. If this is not clear to you please read the "USB Boot Procedure" section 26.1.8.6 of the AM335X Technical Reference Manual Rev. L.

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USB Device Boot Arguments