Hi all,
some time ago I had hard job turning my CPU+Can PC104 stack into a working
state. Main problem was that I was beginning from nothing (doubts on BIOS,
OS, hardware, wires, ...). For some day, I am trying to reinstall all this
stuff on another brand new stack, BUT, I have a proper working hardware to
isolate problems !
I made documents last time to remind me all needed actions but it seems that
I forgot something and I don't know where to look at and scratching my head
:p
Here is the symptoms :
I have :
_ one set of can-wires, with resistors and a working second node (a CAN
controller motor board)
_ one PC104 CAN board with configured jumpers.
_ 2 CPU with "should be identical BIOS settings" (checked by hand for some
interesting sections), one is the old working one, the second is a brand new
installation from 0
If I connect all this and the old CPU board everything working (the motor
runs). If I change to the CPU board nothing works and the interrupts don't
increase in /proc/interrupts. Last time this happened, it was about BIOS
settings. But I am pretty sure it is not coming from BIOS (I am going to
recheck).
*May this non increasing interrupts came from something else ? OS (linux
2.6.35.7) config ?*
My* loading script* is this :
modprobe sja1000_isa irq=11,11 mem=0xD0000,0xD0200 ocr=0x5e,0x5e cdr=0,0
ip link set can0 type can bitrate 250000 restart-ms 1000
ip link set can1 type can bitrate 250000 restart-ms 1000
ifconfig can0 up
ifconfig can1 up
Here is an extract of my *dmesg :*
[ 0.780221] vcan: Virtual CAN interface driver
....
[ 0.799991] can: controller area network core (rev 20090105 abi 8)
...
[ 0.800051] can: raw protocol (rev 20090105)
....
[ 0.800055] can: broadcast manager protocol (rev 20090105 t)
....
[ 9.117593] sja1000_isa sja1000_isa.0: sja1000_isa device registered
(reg_base=0xc00d0000, irq=11)
[ 9.117751] sja1000_isa sja1000_isa.1: sja1000_isa device registered
(reg_base=0xc00d0200, irq=11)
[ 9.117931] Legacy sja1000_isa driver for max. 8 devices registered
[ 9.128343] sja1000_isa sja1000_isa.0: setting BTR0=0x01 BTR1=0x1c
[ 9.129964] sja1000_isa sja1000_isa.1: setting BTR0=0x01 BTR1=0x1c
*lsmod says :*
Module Size Used by
sja1000_isa 2439 -
(because items are not compiled as modules)
root@beta:~# *cat /proc/interrupts*
CPU0
0: 3013125 IO-APIC-edge timer
1: 4 IO-APIC-edge i8042
8: 81 IO-APIC-edge rtc0
9: 0 IO-APIC-fasteoi acpi
*11: 0 IO-APIC-edge can0, can1*
12: 7 IO-APIC-edge i8042
14: 0 IO-APIC-edge ata_piix
15: 2327 IO-APIC-edge ata_piix
19: 0 IO-APIC-fasteoi uhci_hcd:usb3
23: 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb2
40: 2859 PCI-MSI-edge eth0
NMI: 0 Non-maskable interrupts
LOC: 4496 Local timer interrupts
SPU: 0 Spurious interrupts
PMI: 0 Performance monitoring interrupts
PND: 0 Performance pending work
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
MCE: 0 Machine check exceptions
MCP: 11 Machine check polls
ERR: 0
MIS: 0
root@beta:~# *cat /proc/iomem*
00000000-00000fff : reserved
00001000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : PCI Bus 0000:00
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000d0000-000dffff : PCI Bus 0000:00
*000d0000-000d001f : sja1000_isa
000d0200-000d021f : sja1000_isa*
000e0000-000fffff : reserved
000f0000-000fffff : System ROM
.......
The BIOS has the Boot up from lan desactivated (it takes the ISA memory),
and the PnP section with a reserved Irq 11
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