• Timur Tabi's avatar
    tty/powerpc: introduce the ePAPR embedded hypervisor byte channel driver · dcd83aaf
    Timur Tabi authored
    The ePAPR embedded hypervisor specification provides an API for "byte
    channels", which are serial-like virtual devices for sending and receiving
    streams of bytes.  This driver provides Linux kernel support for byte
    channels via three distinct interfaces:
    
    1) An early-console (udbg) driver.  This provides early console output
    through a byte channel.  The byte channel handle must be specified in a
    Kconfig option.
    
    2) A normal console driver.  Output is sent to the byte channel designated
    for stdout in the device tree.  The console driver is for handling kernel
    printk calls.
    
    3) A tty driver, which is used to handle user-space input and output.  The
    byte channel used for the console is designated as the default tty.
    Signed-off-by: default avatarTimur Tabi <timur@freescale.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    dcd83aaf
udbg.h 2.01 KB