I am also getting a similar error. Error given below.
I am using a OMAP3530EVM running linux 2.6.32 kernel along with the filesystem from TI DVSDK ti-dvsdk_omap3530-evm_4_00_00_22 .
The audio source is the on board audio in and out port on the EVM.
The make menuconfig in the kernel is the default config from TI omap3defconfig ie, Device Drivers --> Sound card support -->
Advanced Linux Sound Architecture --> [*] USB sound devices --> <*> USB Audio/MIDI driver
So after the kernel boots the result of the loopback is like this after 3-4 seconds,
root@omap3evm:~# arecord -t raw -c 2 -f S16_LE -D hw:0,0 | aplay -t raw -c 2 -f S16_LE -D hw:0,0
Recording raw data 'stdin' : Signed 16 bit Little Endian, Rate 8000 Hz, Stereo
capture write error (DMA or IRQ trouble?)
arecord: pcm_read:1617: read error: Input/output error
aplay: playback:2297: read error
I also tried removing the USB Audio/MIDO driver from the kernel build. Still the result is the same ,as given below..
root@omap3evm:~# arecord -t raw -c 2 -f S16_LE -D hw:0,0 | aplay -t raw -c 2 -f
S16_LE -D hw:0,0
Recording raw data 'stdin' : Signed 16 bit Little Endian, Rate 8000 Hz, Stereo
capture write error (DMA or IRQ trouble?)
arecord: pcm_read:1617: read error: Input/output error
aplay: playback:2297: read error
root@omap3evm:~# uname -a
Linux omap3evm 2.6.32 #2 PREEMPT Mon Jun 6 17:29:29 IST 2011 armv7l unknown
root@omap3evm:~# cat /proc/interrupts
CPU0
7: 0 INTC TWL4030-PIH
11: 0 INTC prcm
12: 1 INTC DMA
25: 2 INTC OMAP DSS
37: 2527 INTC gp timer
56: 510 INTC i2c_omap
57: 0 INTC i2c_omap
61: 0 INTC i2c_omap
72: 207 INTC serial idle, serial
73: 1 INTC serial idle
74: 1 INTC serial idle
77: 0 INTC ehci_hcd:usb1
83: 0 INTC mmc0
92: 0 INTC musb_hdrc
93: 0 INTC musb_hdrc
335: 0 GPIO ads7846
336: 8272 GPIO eth0
369: 0 twl4030 twl4030_keypad
379: 0 twl4030 rtc0
384: 0 twl4030 mmc0
Err: 0
root@omap3evm:~# Linux omap3evm 2.6.32 #2 PREEMPT Mon Jun 6 17:29:29 IST 2011 ar
mv7l unknown
