On 02/15/2016 12:05 PM, Aleksey Makarov wrote:
This patchset is based on the patchset by Leif Lindholm [1] 'ARM Server Base Boot Requirements' [2] mentions SPCR (Serial Port Console Redirection Table) [3] as a mandatory ACPI table that specifies the configuration of serial console. SPCR support is included in QEMU's ARM mach-virt since 2.4 release. Introduce a new function acpi_console_check(). At the uart port registration, this function checks if the ACPI SPCR table specifies its argument of type struct uart_port to be a console and if so calls add_preferred_console(). Use SPCR to tell if SBSA serial driver should use 32-bit access to registers. To be able to access SPCR table each time any console is registered change __init to __ref for early_acpi_os_unmap_memory(). The patchset should be applied to tty-next.
(trimming) This works on the JunoR2 with a new enough firmware to have the SPCR table. Tested-by: Jeremy Linton <jeremy.linton@xxxxxxx> -- 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
