topic Re: can't use ttySP4 in i.MX Processors

can't use ttySP4

mehmet — Fri, 12 Aug 2011 14:25:10 GMT

Hello,

I need to use application uart 4; /dev/ttySP4. When I try to open I got below command.

Error:: No such device or address

Cannot open "/dev/ttySP4"

I couldn't see device node on /dev directory and I added with below command,

mknod /dev/ttySP4 c 242 4

Then retry and got same error

Thanks.

Mehmet Kurnaz

Re: can't use ttySP4

MaheshMahadevan — Fri, 12 Aug 2011 16:20:11 GMT

UART device on the MX53 are called /dev/ttymxc(0,1,2,3)

For UART4, try using /dev/ttymxc3

Re: can't use ttySP4

GabrielSartori — Thu, 29 Oct 2020 09:12:19 GMT

Hello,

I have got the same problem.

I selected CONFIG_MXS_AUART4_DEVICE_ENABLE in kernel menuconfig.

I have also added the above lines in file mx28evk_pins.c

        {
         .name = "AUART4.RX",
         .id    = PINID_AUART0_CTS,
         .fun   = PIN_FUN2,
         },
        {
         .name = "AUART4.TX",
         .id    = PINID_AUART0_RTS,
         .fun   = PIN_FUN2,
         },

I cannot see in kernel dmesg something like like the above in kernel boot messages.

mxs-auart.4: ttySP4 at MMIO 0x80072000 (irq = 116) is a mxs-auart.4

Re: can't use ttySP4

mehmet — Thu, 10 Nov 2011 10:07:39 GMT

There is no response for 2 months. Where does linux initialize the serial ports? First 4 uarts are ok, but last one cannot be initialized.

Mehmet

Re: can't use ttySP4

KrishnaPavan — Thu, 10 Nov 2011 10:43:53 GMT

Hi,

UART 4 can be tty3/ttyS3/ttymxc3

Re: can't use ttySP4

mehmet — Mon, 14 Nov 2011 07:32:47 GMT

Sorry, it should be UART 5.