Messages in this thread | | | Subject | selfmade serial driver problem with chipset other than VIA | From | giorgos xatzipavlis <> | Date | Mon, 19 Dec 2005 18:12:22 +0200 |
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hello people
this is my first attempt to the linux serial mailling list so i apologize for my mistakes...
i am a newbie in kernel development.
i have made a serial driver cause i want to communicate with a serial device ( a microcontroller ). I have programmed the driver in my computer and everything is working ok. I have an AMD 1000Hz, MSI motherboard with VIA chipset and kernel 2.4.31. I have found informations from Linux Deveice Drivers book. Everything is working ok in my computer but the driver isn't working in computers with INTEL and NVIDIA chipsets. The fact that makes me suspicious about that is that although my driver is registered in /proc/interrupts and /proc/ioports (irq 4-ioport 0x03f8) when ever i call outb from my writer bottomhalf routine the interrupt isn't generated from the hardware(in machines with inter or nvidia chipset).
the flow chart is somethink like that:
1)user space write (getting the data from user)
2)kernel space write (generating the package that i want to send)
3)writer_bottomhalf (i have the package in writer_buffer indexed by a bytes_send variable. Call "outb(writer_buffer[bytes_send],MY_UART+UART_TX)" )
4)interrupt handler (bytes_send++ ,so i can send the next character variable, call "tasklet_schedule(&writer_bottomhalf)" to go to step 3)
in computers with chipsets other than VIA the 4th step (interrupt handler) is never executed.
any ideas?
thank
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