Im facing some problems with serial, linux-2.6.23, getting flooded with this message in logs:
--- serial8250: too much work for irq16 --- Something I notice, in my .dts I have the following lines: serial0: ser...@4500, interrupts = <9 0x8> serial1: ser...@4600, interrupts = <10 0x8> spi: s...@7000, interrupts = <16 0x8> But when kernel starts: --- Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled serial8250.0: ttyS0 at MMIO 0xe0004500 (irq = 16) is a 16550A --- Why IRQ 16? Shouldn't it be IRQ 9? I traced functions calls in 8250.c driver: --- serial8250_interrup() -> serial8250_handle_port() -> transmit_chars() --- "too much work" is for transmiting, but there's nothing to transmit. In my MPC8343 board I have only serial0 connected to a MAX3232, serial1 is floating. I found this comments in linux/drivers/serial/8250.h, and tried to use same defines that they used, but no success: /* * Digital did something really horribly wrong with the OUT1 and OUT2 * lines on at least some ALPHA's. The failure mode is that if either * is cleared, the machine locks up with endless interrupts. */ /* * WindRiver did something similarly broken on their SBC8560 board. The * UART tristates its IRQ output while OUT2 is clear, but they pulled * the interrupt line _up_ instead of down, so if we register the IRQ * while the UART is in that state, we die in an IRQ storm. */ I also tried removing serial1 and spi from .dts, but didn't work. Any sugestions? Cheers, -- Alemao _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
