Linux/AM5728: eMMC alternative boot

Hein Thet Aung

Part Number: AM5726
Other Parts Discussed in Thread: DRA752

Tool/software: Linux

Hi

I am working on my custom board. I am using AM5726 and ti-processor-sdk-linux version 4.

I want to boot from emmc boot partition, aka-alternative boot, aka-raw(boot).

I have followed the steps from here https://e2e.ti.com/support/arm/automotive_processors/f/1020/p/544018/1987634#1987634

After I change SYSBOOT pins to 0b111011 , emmc(boot part) as per TRM and power up the board, I get below debug output

U-Boot SPL 2016.05-00230-gdc11a4c-dirty (Jun 13 2017 - 11:05:18)
DRA752-GP ES2.0
Trying to boot from MMC2
omap_hsmmc_send_cmd : timeout: No status update
spl: mmc partition switch failed
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

Could you please guide me what to do next?

Thank you,
Hein.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

What exactly is your processor? AM572x or DRA752? Which Linux SDK is this?

0 Hein Thet Aung over 8 years ago in reply to Biser Gatchev-XID

Intellectual 280 points

Hi Biser,

I have corrected my question. I am using AM5726 and ti-processor-sdk-linux version 4.

Thank you,
Hein

0 Biser Gatchev-XID over 8 years ago in reply to Hein Thet Aung

TI__Guru**** 393215 points

Thanks. I have notified the software team. They will respond here.

0 Hein Thet Aung over 8 years ago in reply to Biser Gatchev-XID

Intellectual 280 points

Hi Biser, could you please inform the software team again?

Thanks,
Hein

0 Biser Gatchev-XID over 8 years ago in reply to Hein Thet Aung

TI__Guru**** 393215 points

I have escalated the request.

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

TI__Genius 15510 points

I've started looking at this. Can you try an experiment before I did any deeper? The TRM shows boot device 6 as the eMMC boot partition and boot device 7 as the eMMC. Looking at the u-boot code in arch/arm/include/asm/arch-omap5/spl.h, they are reversed:

#define BOOT_DEVICE_MMC2 0x06
#define BOOT_DEVICE_MMC2_2 0x07

Can you try to changing the 6 to 7 and the 7 to 6?

Steve K.

0 Hein Thet Aung over 8 years ago in reply to Steve Kipisz

Intellectual 280 points

Hi Steve,

Thank you for your reply.

I am still getting the same error after I have changed as you said.

U-Boot SPL 2016.05-00118-gdd926c6-dirty (Ju| 19 2017 - 10:20:31)
DRA752-GP ES2.0
Trying to boot from MMC2_2
omap_hsmmc_send_cmd : timeout: No status update
spl: mmc partition switch failed
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

I am expecting MLO to read u-boot.img so that I can boot to any partition I want from u-boot. But I don't know how and where to write u-boot.img to.

Regards,
Hein

0 Steve Kipisz over 8 years ago in reply to Hein Thet Aung

TI__Genius 15510 points

Ok, I'll dig a little deeper.

Steve K.

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Linux/AM5728: eMMC alternative boot