Hi Thomas, Tim: On Thu, Nov 28, 2013 at 09:30:34AM +0100, Thomas Petazzoni wrote: > Dear Ezequiel Garcia, > > On Wed, 27 Nov 2013 15:54:49 -0300, Ezequiel Garcia wrote: > > > > An external device may be keeping the UART busy and preventing LCR > > > from being written. > > > > > > What device is attached to ttyS1? > > > > There's no device attached at ttyS1. I've just tested this in another > > box and it seems the same error is obtained on each unused port: > > Are you sure about this? I suppose you're testing on the Armada XP GP > board, and this board has a 4 ports FTDI chip, and according to the > board schematics the four UARTs are all connected to the FTDI chip. So > from the SoC perspective, ttyS1 is connected to something, as far as I > can understand. Or maybe you also tested Armada XP DB ? > Yeah, sorry about that. I missed the FTDI chip. As Thomas says the XP GP board I'm testing this on, has its four UARTs connected to a FTDI chip. Changing the console port by setting "console=ttyS1,115200" gives this: [..] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled dw-apb-uart d0012000.serial: Couldn't set LCR to 191 dw-apb-uart d0012000.serial: Couldn't set LCR to 191 dw-apb-uart d0012000.serial: Couldn't set LCR to 224 dw-apb-uart d0012000.serial: Couldn't set LCR to 224 d0012000.serial: ttyS0 at MMIO 0xd0012000 (irq = 17, base_baud = 15625000) is a 16550A dw-apb-uart d0012100.serial: Couldn't set LCR to 191 dw-apb-uart d0012100.serial: Couldn't set LCR to 191 dw-apb-uart d0012100.serial: Couldn't set LCR to 224 dw-apb-uart d0012100.serial: Couldn't set LCR to 224 d0012100.serial: ttyS1 at MMIO 0xd0012100 (irq = 18, base_baud = 15625000) is a 16550A console [ttyS1] enabled dw-apb-uart d0012200.serial: Couldn't set LCR to 191 dw-apb-uart d0012200.serial: Couldn't set LCR to 191 dw-apb-uart d0012200.serial: Couldn't set LCR to 224 dw-apb-uart d0012200.serial: Couldn't set LCR to 224 d0012200.serial: ttyS2 at MMIO 0xd0012200 (irq = 31, base_baud = 15625000) is a 16550A dw-apb-uart d0012300.serial: Couldn't set LCR to 191 dw-apb-uart d0012300.serial: Couldn't set LCR to 191 dw-apb-uart d0012300.serial: Couldn't set LCR to 224 dw-apb-uart d0012300.serial: Couldn't set LCR to 224 d0012300.serial: ttyS3 at MMIO 0xd0012300 (irq = 32, base_baud = 15625000) is a 16550A So we get the "Couldn't set" message in all four ports. Tim: Any ideas? -- Ezequiel García, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
