Hi,
sorry, I had problem sending out the previous email.
**********************************************************
Hi all,
I am trying to use UART1 of DM355 (DC3 connector, pin 19 & 21).
At first, I booted the original kernel (came with dvsdk_1_30_00_40) and can see
this in the boot message
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing
disabled
Registering platform device 'serial8250'. Parent at platform
ttyS0 at MMIO 0x1c20000 (irq = 40) is a 16550A
ttyS1 at MMIO 0x1c20400 (irq = 41) is a 16550A
ttyS2 at MMIO 0x1e06000 (irq = 14) is a 16550A
so, it seems that UART1 was enabled already, I wrote a small program that opens
/dev/tts/1 and writes a string to that UART1; put a scope at UART1's TX pin
(DC3 - pin 19), I cannot see any signal though the program worked without any
error message.
Then I tried this:
[EMAIL PROTECTED]:~# cat /proc/interrupts
CPU0
0: 0 vpfe_capture
4: 0 dm644xh3a_af, dm644xh3a_aew
5: 0 dm355_ipipe
8: 31854 davinci_osd
12: 1 musb_hdrc
16: 0 EDMA Completion
17: 0 EDMA CC Err
18: 0 EDMA TC Error
19: 0 EDMA TC Error
26: 984 mmc
27: 984 mmc
32: 2 free-run counter
33: 0 high-res timer
35: 49173 system tick
39: 151 i2c
40: 450 serial
42: 0 dm_spi
45: 10090 eth0
Err: 0
[EMAIL PROTECTED]:~#
there's only interrupt for UART0, no entry for UART1 & UART2.
And [EMAIL PROTECTED]:~# echo hello > /dev/tts/1 took about 30 seconds
to finish!
[EMAIL PROTECTED]:~# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:16550A mmio:0x01C20000 irq:40 tx:4949 rx:191 RTS|CTS|DTR|DSR
1: uart:16550A mmio:0x01C20400 irq:41 tx:0 rx:0 CTS|DSR
2: uart:16550A mmio:0x01E06000 irq:14 tx:0 rx:0 CTS|DSR
3: uart:unknown port:00000000 irq:0
so, the number of tx of UART1 was still 0 after echo hello > /dev/tts/1.
I found and tried everything relate to this problem in this list without
any luck. Has anyone used UART1 on DM355 already? Or do you know how to enable
and use it? Please give me an advice.
Thank you very much,
Viet Hoang.
Send instant messages to your online friends http://uk.messenger.yahoo.com
_______________________________________________
Davinci-linux-open-source mailing list
[email protected]
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
