[U-Boot-Users] How to add Timer Interrupt to u-boot?
Hello all:
Everybody knows how to add Timer Interrupt to the u-boot? I wrote a fuction called timer0_isr(), and wanted to add it to Uboot, but I didn't know what to do, Does the uboot has a funciton like function request_irq() in linux kernel? Thanks in advance!
With kind regards,
Robert Xia
Robert wrote:
Hello all:
Everybody knows how to add Timer Interrupt to the u-boot?I wrote a fuction called timer0_isr(), and wanted to add it to Uboot, but I didn't know what to do, Does the uboot has a funciton like function request_irq() in linux kernel? Thanks in advance!
With kind regards,
Robert Xia
Hi Robert,
Interrupts are not used by u-boot (with some rare exceptions). Generally things poll and there is usually some type of counter register (processor or board-specific) for measuring elapsed time.
If you really need interrupts, you will probably have to set up the vectors, interrupt registers, etc. yourself.
Best regards, gvb
Hi Robert,
Everybody knows how to add Timer Interrupt to the u-boot?I wrote a fuction called timer0_isr(), and wanted to add it to Uboot, but I didn't know what to do, Does the uboot has a funciton like function request_irq() in linux kernel?
As Jerry told you, U-Boot generally avoids using interrupts.
For some architectures however we have code to allow using interrupts, e.g. from standalone applications. You can look at examples/interrupt.c which effectively was written with cpu/mpc5xxx/interrupts.c in mind. The latter was of course derived from the Linux version so it shouldn't be a big problem to do something similar for other architectures.
Cheers Detlev
participants (3)
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Detlev Zundel -
Jerry Van Baren -
Robert