On Mon, Apr 22, 2013 at 9:22 PM, [email protected] <[email protected]>wrote:
> We're designing a new board that uses a MIPS based RT5350. The RT5350
> doesn't have any ADC support so the idea is to also add a Cortex-M0 on the
> board. The Cortex would look like an I2C device to the MIPS CPU.
>
> The MIPS CPU can be initialized via JTAG and it runs Linux. So is it
> feasible to run OpenOCD on the MIPS then bit bang SWD over some GPIO to
> initially program the flash on the Cortex?
>
> This is my first SWD design so I'm still figuring things out.
>
>
That sounds extremely complex, considering for one thing that OpenOCD
doesn't even officially support SWD yet.
I think you would be better off selecting a Cortex-Mx µC that includes a
boot loader in ROM. I think most do. At least I know that many, if not all,
ST devices do. They can be programmed over a simple UART protocol, or some
even via USB or CAN.
Since you still need JTAG for the MIPS you could also pick an only slightly
more expensive Cortex with JTAG and connect it in the chain. For field
upgrades you could still want to have a boot loader on the Cortex, of
course.
/Andreas
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