Hi,
Can anybody tell me how to install a handler for irq0 on an 8xx
platform? Doing the obvious (request_8xxirq (SIU_IRQ0 ...)) doesn't seem
to work. It seems that I need to modify head_8xx.S so that the excption
handler for 0x100 is do_IRQ instead of UnKnownException. I tried the
patch below, but now I get a Software Emulation trap (0x1000). Any help
gratefully accepted.
Chris.
/* System reset */
#ifdef CONFIG_SMP /* MVME/MTX start the secondary here */
STD_EXCEPTION(0x100, Reset, __secondary_start_psurge)
#else
/****
Replace norrmal NMI handler with do_IRQ
STD_EXCEPTION(0x100, Reset, UnknownException)
****/
NMI_Interrupt:
EXCEPTION_PROLOG;
addi r3,r1,STACK_FRAME_OVERHEAD
li r20,MSR_KERNEL
li r4,0
bl transfer_to_handler
.long do_IRQ;
.long ret_from_intercept
#endif
--
Chris Simmonds 2net Limited
chris at 2net.co.uk http://www.2net.co.uk/
Tel: +44 (0)1962 869003 Fax: +44 (0)870 056 7556
"If it's not connected, it's not effective"(tm)
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
