Stanford Linear Accelerator Center PowerPC and VXI Kinetic Systems V151 Embedded PowerPC Slot-0 Controller

Stanford Linear Accelerator Center

PowerPC and VXI

Kinetic Systems V151Embedded PowerPC Slot-0

Controller

Kristi Luchini EPICS Collaboration - Nov 14/17, 2000 - Oak ridge

2

Objective

• Port the EPICS low-level RF code to another VXI slot-0 controller

vxWorks 5.3.1 and EPICS R3.13.2 Current cpu, niCpu030 has been discontinued Crate profile – SLAC VXI register based modules and AB

VME Scanner

• Why choose the PowerPC Pressure at SLAC to replace niCpu030 Intel slot-0 controllers (NI) did not have favorable reviews Consistency; one ppc architecture for VMEbus and VXIbus

projects at SLAC byte orientation (big endian) is the same as the 68K

architecture of the niCpu030


3

Hardware Issues

• Elma crate power-on hang • SYSRST not asserted on reboot• D8/D16 IACK Cycle • SLAC VXI modules and the VXI spec• Interrupt controller uses a

mechanism for autovectoring VME interrupts


4

Software Issues• Learning about the VXIbus Standard as well the SLAC

VXI register-based modules.• Interrupts

1 Interrupt Level instead of 7 as with 68k Architectory Missing functions intVecGet Unsolicited Interrupt Handlers – different naming standard VXI mode vs. VME mode

• Lack of atomic Read-Modify-Write• VXI Library

Incorrect and/or buggy library - Resman crashes Missing basic functions – GetMyLA,SetMODID VXI library initialization

• A32 Space – device window configuration EPICS_VXI_A32_BASE 0x20000000 0x9000000 EPICS_VXI_A32_SIZE 0x00100000 0x1000000


5

Code Changes• EPICS Code changed

drvEpvxi.c,devLib.c,veclist.c – table of unsolicited interrupts Crate a dummy isr static void *vmeArgTbl[ 7] ; devInterruptConnectVXI( level,isr,parm ) dummyISR(controller,statusId,level) { myVmeIsr( vmeArgTbl( vmeArgTbl[level-1] ) ) }

• Bsp kernel changes Adding functionality – sysBusTas,intVecGet (Andrew Johnson) VXI vs VME mode – VXI/VME fighting for control of the bus sysUniverseIntHandler – VXI vs VME mode sysVme.c - KSC method of taking control of VME interrupt

autovectoring

t;;


6

Vector Table0

…

…

...

11

…

…

…

254

255

Handler

Argument

Next

Universe VME InterruptkscIntHandler

sysUniverseIntHandler

vxiBaseIsr

PPC External Interrupt

Vector 0x500


7

VXI Vector Table

Level ISR

1 DefaultVXIintHandler







Kristi Luchini EPICS Collaboration Mtg. - Nov 14-16,2000 Oak Ridge

8

Conclusions• Prefer a BSP supported by the OS• Ask for VXI library code• Awaiting SLAC VXI board

modification to recognize D8 IACK cycle

Documents

Stanford Linear Accelerator Center PowerPC and VXI Kinetic Systems V151 Embedded PowerPC Slot-0 Controller