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Date:	Wed, 21 May 2014 21:45:02 -0700 (PDT)
From:	Varka Bhadram <>
Subject: [OMAP-Serial] omap ttyO2 problem


I am using the kernel 3.12 from beagleboard. I loaded the overlay to enable
the ttyO2 on BBB.

    echo BB-UART1 > /sys/devices/bone_capemgr.*/slots

It created the ttyO2 device node in /dev.

in dmesg :
[   76.077679] bone-capemgr bone_capemgr.6: part_number 'BB-UART1', version
[   76.077761] bone-capemgr bone_capemgr.6: slot #7: generic override
[   76.077789] bone-capemgr bone_capemgr.6: bone: Using override eeprom data
at slot 7
[   76.077818] bone-capemgr bone_capemgr.6: slot #7: 'Override Board
Name,00A0,Override Manuf,BB-UART1'
[   76.078444] bone-capemgr bone_capemgr.6: slot #7: Requesting part
number/version based 'BB-UART1-00A0.dtbo
[   76.078479] bone-capemgr bone_capemgr.6: slot #7: Requesting firmware
'BB-UART1-00A0.dtbo' for board-name 'Override Board Name', version '00A0'
[   76.086769] bone-capemgr bone_capemgr.6: slot #7: dtbo
'BB-UART1-00A0.dtbo' loaded; converting to live tree
[   76.087041] bone-capemgr bone_capemgr.6: slot #7: #2 overlays
[   76.116716] of_get_named_gpio_flags: can't parse gpios property of node
[   76.140196] *omap_uart 48024000.serial:
serial_omap_get_context_loss_count failed : -22*
[   76.140323] omap_uart 48024000.serial: serial_omap_type+2
[   76.140347] 48024000.serial: ttyO2 at MMIO 0x48024000 (irq = 90,
base_baud = 3000000) is a OMAP UART2
[   76.140368] omap_uart 48024000.serial: serial_omap_pm+2
[   76.140394] omap_uart 48024000.serial: serial_omap_set_mctrl+2
[   76.140415] omap_uart 48024000.serial: serial_omap_pm+2
[   76.143291] bone-capemgr bone_capemgr.6: slot #7: Applied #2 overlays.

How can i test the this UART working ?

I write a simple code to open("/dev/ttyO2",O_RDWR), and writes "hello", But
i am not getting the data on TX pin (P9.24) of BBB.

Am i missing any thing ?

Thanks in advance...

Varka Bhadram. 

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