AM335x : How to reduce the times of boot-up stream "CCC"

user1501618

Prodigy 140 points

Other Parts Discussed in Thread: TMDXEVM3358

Hi guys,

I am using the am335x-evm, and I want to reduce the boot-up time.

I found out that after switch on the power, console will appear the steady stream 'C'.

By reference this website : processors.wiki.ti.com/.../AM335x_board_bringup_tips

The 'C' means this device is alive, it will appear three times and cost about 3 sec normally.

On the other hand, If I press any key when switch on the power immediately, the 'C' doesn't appear then the first line of uboot

"U-Boot 2014.07-00001-g4a8e5b8-dirty" will be printed at once.

My question is that is there have any way to reduce the times of boot-up tips without any key pressed?

thanks,

Steve

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Hi,

Which EVM board is this? Note that the "CCCC" string is only prined out when UART boot is attempted and no other valid boot sources are found.

0 user1501618 over 8 years ago in reply to Biser Gatchev-XID

Prodigy 140 points

Hi Biser
AM335x EVM (TMDXEVM3358) ← Is that you mean?

My boot up source is SD card. Whatever I plugin the SD card or not, the "CCC" string will be printed out when switch on power. Event I plugin the SD card, the device still cost about 3 sec to print "CCC", then entry u-boot / kernel...
But I found out that If I press Enter when switch on power, the 3 sec for print "CCC" could be skipped.
Is there have any way to skip the 3 sec for print "CCC" entry u-boot directly without pressing keyboard ?

0 Biser Gatchev-XID over 8 years ago in reply to user1501618

TI__Guru**** 393215 points

Check your boot switch settings. See this wiki for details: processors.wiki.ti.com/.../AM335x_U-Boot_User's_Guide
SW3 positions 5 to 1 correspond to SYSBOOT4 to SYSBOOT0. In order to boot directly from SD card you must set these to 10111b.

0 user1501618 over 8 years ago in reply to Biser Gatchev-XID

Prodigy 140 points

Hi Biser,
Thanks a lot , that's what I need.

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AM335x : How to reduce the times of boot-up stream "CCC"