Xenomai booted with the 2.6.33 kernel on BeagleBoard!
I built the below 2.6.33 kernels...
* No Angstrom patches, no Adeos patch - - it booted, I noticed that
/proc/interrupts showed no interrupts occurred on IRQs 7 or 378
(SD card Detect). The 2.6.31 kernel showed 2 on each IRQ just
after boot.
* No Angstrom patches, Adeos patch, but Xenomai disabled - - it
booted. Still no interrupts on IRQs 7 or 378.
* No Angstrom patches, Adeos patch, and Xenomai enabled - - it
booted! :-) Still no interrupts on IRQs 7 or 378.
Something obviously changed in the kernel between 2.6.31 and 2.6.33 to
suppress the IRQ 378 interrupts that occurred at boot time. This change
*may* be the reason that Xenomai works on the Beagleboard at 2.6.33, but
not at 2.6.31.
I suspect that the Adeos patch may have trouble handling Level 2
interrupts coming through a twl4030 device. I know that it is an OMAP
design practice to route the SD/MMC Card Detect interrupt through this
device. The device also controls several voltage regulators supplying
power to the board and OMAP chip. Overvoltage/undervoltage/thermal
alerts may also be originated by this device.
The easiest way to test the twl4030 interrupt handling may be to use the
SD Card for a removable file system (not root). If the file system
automounts when the SD Card is plugged in, that would indicate that the
twl4030 interrupts are being handled correctly. From the available
documentation, the micro-SD card slot on the IGEPv2 should be able to be
used for this testing.
My current dilemma is to figure out how to move the pieces of Angstrom
that I want from the 2.6.32 kernel system to the 2.6.33 kernel ahead of
the Angstrom train. :-(
Many thanks for you help Gilles.
Now that I can see Xenomai running, is there any documentation that
describes useful things I can poke to obtain Xenomai state, status and
statistics? (for example the meanings of the data in the /proc/Xemomai
directory)
Regards,
Bob Feretich
On 7/20/2010 2:24 PM, Gilles Chanteperdrix wrote:
Bob Feretich wrote:
I have downloaded the 2.6.33 omap kernel and I 'm starting to work
with it. I'll write again when I have a clean boot of the vanilla kernel
and tried to boot again with the Adeos patch.
I think that I figured out how to tell OpenEmbedded to build it.
When you display /proc/interrupts on the IGEPv2, do you see interrupts
occuring at IRQs greater or equal to IRQ 384?
Do you see the same number reflected in IRQ 7?
I see this:
CPU0
7: 104068 INTC TWL4030-PIH
12: 4 INTC DMA
37: 1408 INTC gp timer
56: 313486 INTC i2c_omap
61: 0 INTC i2c_omap
74: 42 INTC serial
77: 93 INTC ehci_hcd:usb2
83: 66 INTC mmc0
86: 12 INTC mmc1
92: 1 INTC musb_hdrc
336: 809 GPIO eth0
378: 0 twl4030 twl4030_usb
384: 0 twl4030 mmc0
I believe the interrupts tagged "twl4030" are chained interrupts. Having
looked at the code, these interrupts are not chained the usual way
because they require i2c communication, which in turn requires a context
allowed to sleep, so they are dispatched by a kernel thread.
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