Linux/AM5708: UART boot

Andi_12a

Intellectual 780 points

Part Number: AM5708

Tool/software: Linux

sdk version: processor-sdk-4.3

Hi,

I want to use uart to boot up 5708, is it same to 5728? Is there any guidence?

Thank you,

Andi

over 6 years ago

0 Brad Griffis over 6 years ago

TI__Guru*** 125430 points

Andi,

The hardware info is in Chapter 33 "Initialization" of the Technical Reference Manual. Specifically:

Note that UART3 is routed to multiple sets of pins. There is only ONE SET that is used by the Boot ROM. See Table 33-10. Pin Multiplexing According to Boot Peripheral.
For the sysboot configuration see Table 33-9. Booting Devices Order.

Aside from those top level hardware details, the actual mechanism (e.g. software flow) will be the same as other devices such as AM572x. I find this wiki page to be very useful with respect to UART boot on these devices:

http://processors.wiki.ti.com/index.php/DRA7xx_GLSDK_Software_Developers_Guide#Using_UART_boot

In particular, I recommend using the serial-boot.pl utility on that page for sending MLO.

The serial-boot.pl script is specifically for loading MLO. Once you’ve loaded MLO, you’ll use ymodem (e.g. through Tera Term, etc.) for loading u-boot. Note: this implies that you must add CONFIG_SPL_YMODEM_SUPPORT as part of your SPL/u-boot build if it’s not there already.

There’s a pretty nice presentation walking through these details here.

Best regards,
Brad