AM2634: Can I program external-flash using any of the non-uniflash SBLs?

Hi Jim,

Thank you for your query.

jimj2713 said:

but I don't see the hooks in these prebuilt bootloaders to program the external flash -- is that possible, or do I have to write my own SBL to program the external flash?

TI provides the example code for the all the pre built sbls, You can use the source code as reference to build your own custom bootloader and flasher also.

Nilabh,

Thank you for the quick replies; I am still reading all of the bootloader documentation to try to understand what our new circuit-board requirements are. Is it accurate to write -- in the final product, I cannot use CAN alone to update the resident application? This is because UART must be used to flash in the CAN-SBL, and then the CPU is booted via QSPI to load in the application via CAN?

Thanks,

Jim

Yes that is correct you will need UART in this case.

Can I write to flash if I boot in the UART-boot mode? If looks like the UART-boot pin (SOP0) is also QSPI_D0. Does that SOP0 active prevent access to the QSPI flash?

Thanks,

Jim

Also from the TRM, there is this statement, "For UART boot, UART pins are left configured as UART boot. QSPI pins are NOT touched in this boot mode". 

Can I modify the UART secondary bootloader to configure the QSPI pinmux, and if my new hardware can somehow disable the UART-boot-pint (SOP0), should I be able to write to flash even though I started in UART-boot mode?

Thanks,

Jim

Yes you can write to flash in UART boot mode.

The UART uniflash example does exactly same.

It receives an application image via UART and writes it to flash

I need to check this without HW team once.

Yes you can use UART uniflash example to write to flash in UART boot mode.

the example is already provided.