[U-Boot-Users] U-BOOT and UART TX with interrupts (need help please)

[veter <veter2000@rambler.ru>]

I greet you!
It is hope for your help!

The fact is that we have decided to base / Platform U-BOOT make its program
to develop so it is ready realizovanno many software tools.

Interruption we need to make our CPU BlackFin we can use with DMA capability
and maximize productivity gains.

Core, we want to use and abandonment of the CPU and DMA (BlackFin 532).
In fact, we will have passed a very big massyvy in UART and use DMA, we will
win big, because 90% of CPU performance will be employed mathematical
calculations.

For that reason has much to use the lack of interruption, please help!



wd wrote:
> 
> In message <12896654.post@talk.nabble.com> you wrote:
>> 
>> Our program based on U-BOOT and we need transmit data at UART-TX with
>> interrupts.
> 
> What makes you think you need interrupts? U-Boot is  strictly  single
> tasking,  so  it will not do anything else anyway while transmitting,
> and even a very slow CPU should be capable  of  streaming  characters
> out or an UART then.
> 
>> But, as we understand, U-BOOT do not have "API" for correct realization
>> Interrupts, we fount in cpu/bf532/serial.c each initialization with as-be
>> usage Interrupts, but not used it, because only doing looping ISR
>> register
>> on FLAG IRQ_UART_TX_BIT.
> 
> Indeed polling is all you need.
> 
>> It is not correct usage Interrupts. We need full usage interrupts.
> 
> What makes you think so? Interrupts will not give you any advantages.
> 
> Best regards,
> 
> Wolfgang Denk
> 
> 

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