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RTOS/DRA71XEVM: How to improve the hwi priority in ti bios

Part Number: DRA71XEVM

Tool/software: TI-RTOS

Hi 

when i use the DRA71XEVM  bsp uart driver,  

i find that , after callling GIO_addDevice, the uartMdCreateChan will add interrupt function uartisr to ti bios, the priority of uartisr is 0xff which is  the default value of hwi.

i used the Hwi_setPriority to set the priority of uart to 0 or 1, the uartisr interrupt became to not be called anymore .

now i want to know how to improve the priority of hwi correctly,  is there anybody know how to do that?