Re: [Xen-devel] [PATCH V3 36/41] xen/arm: Don't use pl011 UART by default for early printk

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-05-10 at 03:18 +0100, Julien Grall wrote:
> Add CONFIG_EARLY_PRINTK options in configs/arm{32,64}.mk to let the user
> to choose if he wants to have early output, ie before the console is 
> initialized.
> 
> This code is specific for each UART. When CONFIG_EARLY_PRINTK is enabled,
> Xen will only be able to run on a board with this UART.
> 
> If a developper wants to add support for a new UART, he must implement the
> following assembly macro/define:
>    - EALY_UART_BASE_ADDRESS: variable which contains the physical base address
>    for the UART
>    - early_uart_init: initialize the UART
>    - early_uart_ready: check and wait until the UART can transmit a new
>    character
>    - early_uart_transmit: transmit a character
> 
> For more details about the parameters of each function,
> see arm{32,64}/debug-pl011.inc comments.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>



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