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README.irq @ 9b4422a2

4.115

Last change on this file since 9b4422a2 was ee732739, checked in by Joel Sherrill <joel.sherrill@…>, on 09/13/07 at 14:26:24

2007-09-07 Kate Feng <feng1@…>

ChangeLog?, Makefile.am, README, README.booting, README.irq, preinstall.am, GT64260/MVME5500I2C.c, include/bsp.h, irq/irq.c, irq/irq.h, irq/irq_init.c, pci/detect_host_bridge.c, pci/pci.c, pci/pci_interface.c, pci/pcifinddevice.c, start/preload.S, startup/bspclean.c, startup/bspstart.c, startup/pgtbl_activate.c, startup/reboot.c, vectors/bspException.h, vectors/exceptionhandler.c: Merge my improvements in this BSP including a new network driver for the 1GHz NIC.
network/if_100MHz/GT64260eth.c, network/if_100MHz/GT64260eth.h, network/if_100MHz/GT64260ethreg.h, network/if_100MHz/Makefile.am, network/if_1GHz/Makefile.am, network/if_1GHz/POSSIBLEBUG, network/if_1GHz/if_wm.c, network/if_1GHz/if_wmreg.h, network/if_1GHz/pci_map.c, network/if_1GHz/pcireg.h: New files.

File size: 810 bytes

Rev	Line
[ee732739]	1	README.irq : Shuchen Kate Feng <feng1@bnl.gov>, Sept. 2, 2007
[7be6ad9]	2
[ee732739]	3	As per implementation in shared PPC code,
	4	the BSPirqPrioTable[96] listed in irq_init.c is where the
[7be6ad9]	5	software developers can change the levels of priority
[ee732739]	6	for all the interrupts based on the need of their
	7	applications. The IRQs can be eanbled dynamically via the
	8	BSP_enable_pic_irq(), or disbaled dynamically via the
	9	BSP_disable_pic_irq().
[7be6ad9]	10
	11
[ee732739]	12	Support for run-time priority setup could be
	13	added easily, but there is no action taken yet due to concerns
	14	over computer security at VME CPU level.
[7be6ad9]	15
	16
[ee732739]	17	The software developers are forbidden to setup picIsrTable[],
	18	as it is a powerful engine for the BSP to find the pending
	19	highest priority IRQ at run time. It ensures the fastest/faster
	20	interrupt service to the highest/higher priority IRQ, if pending.

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