• Thierry Escande's avatar
    firmware: google memconsole: Add coreboot support · d384d6f4
    Thierry Escande authored
    Coreboot (http://www.coreboot.org) allows to save the firmware console
    output in a memory buffer. With this patch, the address of this memory
    buffer is obtained from coreboot tables on x86 chromebook devices
    declaring an ACPI device with name matching GOOGCB00 or BOOT0000.
    
    If the memconsole-coreboot driver is able to find the coreboot table,
    the memconsole driver sets the cbmem_console address and initializes the
    memconsole sysfs entries.
    
    The coreboot_table-acpi driver is responsible for setting the address of
    the coreboot table header when probed. If this address is not yet set
    when memconsole-coreboot is probed, then the probe is deferred by
    returning -EPROBE_DEFER.
    
    This patch is a rework/split/merge of patches from the chromeos v4.4
    kernel tree originally authored by:
     Vadim Bendebury <vbendeb@chromium.org>
     Wei-Ning Huang <wnhuang@google.com>
     Yuji Sasaki <sasakiy@google.com>
     Duncan Laurie <dlaurie@chromium.org>
     Julius Werner <jwerner@chromium.org>
     Brian Norris <briannorris@chromium.org>
    Signed-off-by: default avatarThierry Escande <thierry.escande@collabora.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    d384d6f4
coreboot_table-acpi.c 2.15 KB