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UART0,2,3,4,5

Question asked by Nouchi on May 19, 2014
Latest reply on May 20, 2014 by Nouchi

Hello,

 

With linux system, how to enable other UARTs for applications (not for system console)?

 

Best regards,

Emmanuel

 

 

Edit :

I found a partial answer here : Re: Vybrid UART's from Linux

It works fine for UART0 to UART3

[ 0.292014] Serial: MVF driver
[ 0.292181] IMX UART EDMA enabled
[ 0.292199] IMX UART FIFO enabled
[ 0.292237] imx-uart.0: ttymxc0 at MMIO 0x40027000 (irq = 93) is a IMX
[ 0.292879] IMX UART EDMA enabled
[ 0.292899] IMX UART FIFO enabled
[ 0.292931] imx-uart.1: ttymxc1 at MMIO 0x40028000 (irq = 94) is a IMX
[ 0.305430] console [ttymxc1] enabled
[ 0.309808] IMX UART EDMA enabled
[ 0.313166] IMX UART FIFO enabled
[ 0.316513] imx-uart.3: ttymxc3 at MMIO 0x4002a000 (irq = 96) is a IMX

 

 

, but crash kernel (panic) at boot time.

[ 0.323728] IMX UART RTS/CTS enabled
[ 0.327314] IMX UART FIFO enabled
[ 0.330690] imx-uart.5: ttymxc5 at MMIO 0x400ab000 (irq = 98) is a IMX
[ 0.337240] Unhandled fault: external abort on non-linefetch (0x1008) at 0x8883600d
[ 0.334915] Internal error: : 1008 [#1]
[ 0.338759] Modules linked in:
[ 0.331845] CPU: 0 Not tainted  (3.0.15-ts-armv7l #119)
[ 0.337361] PC is at imx_set_mctrl+0x14/0x5c
[ 0.331653] LR is at uart_add_one_port+0x298/0x3b8
[ 0.336465] pc : [<802785d4>] lr : [<80275f9c>] psr: 60000093
[ 0.336480] sp : 8602dda8  ip : 8602ddc0  fp : 8602ddbc
[ 0.337968] r10: 860c0120  r9 : 80464860  r8 : 60000013
[ 0.333209] r7 : 8618aac4  r6 : 863fd200  r5 : 863fd200  r4 : 804b8a94
[ 0.339750] r3 : 88836000  r2 : ffffffff  r1 : 00000000  r0 : 863fd200
[ 0.336292] Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[ 0.333707] Control: 10c53c7d  Table: 80004059  DAC: 00000015
[ 0.339466] Process swapper (pid: 1, stack limit = 0x8602c2e8)
[ 0.335312] Stack: (0x8602dda8 to 0x8602e000)
[ 0.339696] dda0:               804b8a94 8618aa94 8602de4c 8602ddc0 80275f9c 802785cc
[ 0.337903] ddc0: 00000005 8602dde0 00000062 80463364 5d343133 00000062 00000005 80463374
[ 0.336109] dde0: 4f494d4d 34783020 62613030 00303030 00000000 00000000 00000000 863fd200
[ 0.334315] de00: 860bfe00 804a44d0 860c00e0 860bfe08 00000000 8001a26c 8602de3c 8602de28
[ 0.332520] de20: 803ad504 863fd200 860bfe00 804a44d0 860c00e0 860bfe08 00000000 8001a26c
[ 0.330727] de40: 8602de74 8602de50 80279504 80275d10 802793c8 860bfe08 804e0c98 860bfe3c
[ 0.338932] de60: 804b8b2c 00000000 8602de84 8602de78 802817dc 802793d4 8602dea4 8602de88
[ 0.337138] de80: 802803fc 802817c8 860bfe08 804b8b2c 860bfe3c 860dec60 8602dec4 8602dea8
[ 0.335344] dea0: 802805a8 80280374 80280514 00000000 804b8b2c 80280514 8602deec 8602dec8
[ 0.333550] dec0: 8027f30c 80280520 860230f8 86052db0 80231bc0 804b8b2c 804b8b2c 804b9030
[ 0.331756] dee0: 8602defc 8602def0 802800c0 8027f2cc 8602df2c 8602df00 8027fd60 802800a8
[ 0.339961] df00: 80446b18 8602df10 804b8b2c 80023404 804c6380 8602c000 00000000 8001a26c
[ 0.338167] df20: 8602df54 8602df30 80280aa0 8027fbec 00000000 80023404 804c6380 8602c000
[ 0.336373] df40: 00000000 8001a26c 8602df64 8602df58 80281bd8 80280a2c 8602df7c 8602df68
[ 0.334579] df60: 8001a298 80281b98 00000000 8002331c 8602dfd4 8602df80 8008d464 8001a278
[ 0.332784] df80: 800db034 801543f0 0000019f 00000000 8602dfb4 31342580 00000035 00000000
[ 0.330990] dfa0: 8602dfbc 000001b0 804b11b4 8002331c 80023404 800aa3d4 00000013 00000000
[ 0.339195] dfc0: 00000000 00000000 8602dff4 8602dfd8 800089d0 8008d348 00000000 00000000
[ 0.337402] dfe0: 00000000 80008950 00000000 8602dff8 800aa3d4 8000895c 71577773 df7d3373
[ 0.335587] Backtrace:
[ 0.338083] [<802785c0>] (imx_set_mctrl+0x0/0x5c) from [<80275f9c>] (uart_add_one_port+0x298/0x3b8)
[ 0.337147]  r5:8618aa94 r4:804b8a94
[ 0.330779] [<80275d04>] (uart_add_one_port+0x0/0x3b8) from [<80279504>] (serial_imx_probe+0x13c/0x244)
[ 0.330216] [<802793c8>] (serial_imx_probe+0x0/0x244) from [<802817dc>] (platform_drv_probe+0x20/0x24)
[ 0.339532]  r8:00000000 r7:804b8b2c r6:860bfe3c r5:804e0c98 r4:860bfe08
[ 0.336133] r3:802793c8
[ 0.338807] [<802817bc>] (platform_drv_probe+0x0/0x24) from [<802803fc>] (driver_probe_device+0x94/0x1ac)
[ 0.338414] [<80280368>] (driver_probe_device+0x0/0x1ac) from [<802805a8>] (__driver_attach+0x94/0x98)
[ 0.337733]  r7:860dec60 r6:860bfe3c r5:804b8b2c r4:860bfe08
[ 0.333481] [<80280514>] (__driver_attach+0x0/0x98) from [<8027f30c>] (bus_for_each_dev+0x4c/0x94)
[ 0.332453]  r6:80280514 r5:804b8b2c r4:00000000 r3:80280514
[ 0.338200] [<8027f2c0>] (bus_for_each_dev+0x0/0x94) from [<802800c0>] (driver_attach+0x24/0x28)
[ 0.336999]  r6:804b9030 r5:804b8b2c r4:804b8b2c
[ 0.331689] [<8028009c>] (driver_attach+0x0/0x28) from [<8027fd60>] (bus_add_driver+0x180/0x250)
[ 0.330512] [<8027fbe0>] (bus_add_driver+0x0/0x250) from [<80280aa0>] (driver_register+0x80/0x144)
[ 0.339509] [<80280a20>] (driver_register+0x0/0x144) from [<80281bd8>] (platform_driver_register+0x4c/0x60)
[ 0.339304] [<80281b8c>] (platform_driver_register+0x0/0x60) from [<8001a298>] (imx_serial_init+0x2c/0x50)
[ 0.339001] [<8001a26c>] (imx_serial_init+0x0/0x50) from [<8008d464>] (do_one_initcall+0x128/0x1a8)
[ 0.338065]  r4:8002331c r3:00000000
[ 0.331693] [<8008d33c>] (do_one_initcall+0x0/0x1a8) from [<800089d0>] (kernel_init+0x80/0x11c)
[ 0.330433] [<80008950>] (kernel_init+0x0/0x11c) from [<800aa3d4>] (do_exit+0x0/0x608)
[ 0.338362]  r5:80008950 r4:00000000
[ 0.331984] Code: e92dd830 e24cb004 e5903004 e1a05000 (e5d3400d)
[ 0.348157] ---[ end trace 65f8ea860415c04f ]---
[ 0.352817] Kernel panic - not syncing: Attempted to kill init!

 

 

I tried to disable DMA and FIFO on uart5 without success.

Does anybody have an idea?

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