On 12/19/07, Pranav Desai pranavdes@gmail.com wrote:
Hi,
I am a newbie on u-boot development and am working on at91sam9261ek board. I needed the device keypad(keypad works on pio lines) to work with u-boot. I wrote a driver of sorts for this keypad. But got stuck at registering an interrupt for it.
Although I eventually found a work around by polling the status registers and the keypad worked perfectly, I just wanted to know if it is possible to do so using interrupt handling ? As searching the list I came across many posts which said that u-boot does not support interrupt handling.
If this cannot be done then do I have to do something manually in order for interrupt handling to work? Please enlighten me :)
Thank you
Pranav
Hi again,
I tried implementing the irq support for at91sam9261ek taking the help of the list archive.
I configured AIC for interrupt and also the PIO lines. I also tried to enable interrupt on the arm controller. But I am stuck again, u-boot hangs at these particular instructions which is used to enable interrupt on arm
mrs r1, cpsr bic r1, r1, #0x80 msr cpsr_c, r1 /* It hangs precisely at this instruction */
I am just trying learn about u-boot. what exactly am I doing wrong? Please help.