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1 How to enable early printk
4 may want to enable it if you are debugging code that executes before the
7 Note that selecting this option will limit Xen to a single UART definition.
8 Attempting to boot Xen image on a different platform *will not work*, so this
9 option should not be enable for Xens that are intended to be portable.
12 "Early printk" in the "Debugging options" of Kconfig. You will then need to
16 physical address of the UART to use.
20 - CONFIG_EARLY_UART_8250_REG_SHIFT is, optionally, the left-shift to
21 apply to the register offsets within the uart.
24 should be used to configure the UART at start of day.
26 If CONFIG_EARLY_UART_PL011_BAUD_RATE is set to 0 then the code will
27 not try to initialize the UART, so that bootloader or firmware
31 of the UART. Default to version NONE.
35 As a convenience it is also possible to select from a list of