Linux/DM3730: Boot from serial

ranchu

Guru 20755 points

Part Number: DM3730

Tool/software: Linux

Hello,

I am using EVB for dm3730 and can boot from SD and NAND without issues, but I have problems booting from serial.

The sys_boot is configured as following:

SYS_BOOT_0	1
SYS_BOOT_1	1
SYS_BOOT_2	1
SYS_BOOT_3	1
SYS_BOOT_4	0
SYS_BOOT_5	Boot Select
SYS_BOOT_6	1

According to TRM:

when sys_boot[5] = 0 the boot order is:

0b01111: NAND USB UART3 MMC1

when sys_boot[5] = 1 the boot order is:

0b01111: USB UART3 MMC1 NAND

I have fully erased nand, removed SD, and try to boot with boot sw (and also tried sw off), but same results: it seems to start xloader for 1 seconds and then it stops.

It is also interesting that sd boot is possible only with sys_boot5=1 (pressing switch) though that according to above boot order, in both options , it also should try SD boot .

Thanks for any idea,

Ran

over 6 years ago

0 Cvetolin Shulev-XID over 6 years ago

TI__Guru 65405 points

Hi Ran,

Your configuration is correct but I need additional clarification about SYS_BOOT_6 = 1 - an external clock source is supplied to the sys_xtalin input pin (bypass mode). Is it true?

BR
Tsvetolin Shulev

0 ranchu over 6 years ago in reply to Cvetolin Shulev-XID

Guru 20755 points

HI Cvetolin,

I think you're right - please see schematics below.

So, what does it mean ? I see in TRM that only sys_bios[5-0] determine the boot order ?

- \

Thanks,

Ran

0 Cvetolin Shulev-XID over 6 years ago in reply to ranchu

TI__Guru 65405 points

Ran,

As I see at schematics SYS_BOOT_6 = 1 is correct because sys_xtall is connected to I2C3_SCL.

BR
Tsvetolin Shulev

0 ranchu over 6 years ago in reply to Cvetolin Shulev-XID

Guru 20755 points

Hi Tsvestolin
But what does ot mean in relation to the original question ? Why there is no boot from serial?

Thanks
Ran

0 Cvetolin Shulev-XID over 6 years ago in reply to ranchu

TI__Guru 65405 points

Ran,

I only made sure that the SYS_BOOT_6 value is correct because I suspected that the issue could be due to inaccuracy of this value. Now I continue investigating the issue?

BR
Tsvetolin Shulev

0 ranchu over 6 years ago in reply to Cvetolin Shulev-XID

Guru 20755 points

Yes, please.

Best Regards,

Ran

0 ranchu over 6 years ago in reply to ranchu

Guru 20755 points

Hello Cvetolin,

Is there any idea why booting from serial does not function ?

Thank you!

Ran

0 Edison Gao over 6 years ago in reply to ranchu

Prodigy 140 points

Hello ranchu,
I have the same problem,what i do is download the x-load.bin with the tools of pserial .That much goes smoothly.but the x-load.bin do not exeute.booting fail

0 ranchu over 6 years ago in reply to Edison Gao

Guru 20755 points

Hi user5052928 ,

I am using flash tool 1.6. Is that the tool you are using ?

It works OK when using "downloading and execute",

The thing is that it seems to me that this tool actually initlize DDR and than load image into ddr (offset from ddr start) . Is that correct ?

It does not required x-loader/MLO, just u-boot, according to my testing.

Thanks,

Ran

0 Edison Gao over 6 years ago in reply to ranchu

Prodigy 140 points

Hi ranchu
I using the tool called pserial and ukermit.
just following the ways of elinux.org/BeagleBoardRecovery.
i never using the flash tool 1.6 so that i can't answer you.
once you solve the problem please tell me how to do it
board:omap3evm
Thanks
Edison

0 ranchu over 6 years ago in reply to Edison Gao

Guru 20755 points

Hi,

I actually don't have a problem now.
I was just curious if flash utility initialize ddr (becuase I thought that only x-loader does that), but it seems that it does (probably).
I use flash utility (on xp only) with dm3730, and load ("download and execute") u-boot (no xloader/mlo load) to sdram(=ddr ?) , and it starts just fine.

Thanks,
Ran

0 ranchu over 6 years ago in reply to ranchu

Guru 20755 points

It is said in flash tool documentation: "Internally, the tool makes use of a ROM code mechanism for peripheral boot from UART
or USB to transfer compatible drivers to the internal memory of the OMAP device. These drivers provide
the mechanism by which the host applications can program binary images into the internal memories
(NAND and SDRAM) of the target. All of this operation is hidden from the user."

0 Edison Gao over 6 years ago in reply to ranchu

Prodigy 140 points

hi Ran?
i use the tools of flash v1.6 that you suggest
and follow your ways.
the u-boot.bin starts
thanks a lot.
edison

0 ranchu over 6 years ago in reply to Edison Gao

Guru 20755 points

Hi Edison,

You're welcome. Thanks for updating :)
It is really nice that this tools initialize the ddr itself, (without need for x-loader loading). It works like magic.

Bye,
Ran

Processors

Processors forum

Linux/DM3730: Boot from serial