[U-Boot] [PATCH] mx6sabre_common: Avoid console hang due to small CONFIG_SYS_PBSIZE

[Stefano Babic <sbabic@denx.de>]

Hi Fabio,

On 19/05/2014 04:02, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam@freescale.com>
> 
> Entering the maximum number of characters defined by CONFIG_SYS_CBSIZE into 
> the console and hitting enter afterwards, causes a hang in the system because
> CONFIG_SYS_PBSIZE is not capable of storing the characters of the error message:
> "Unknown command '' - try 'help'"
> 
> Increase the size of CONFIG_SYS_PBSIZE so that it can store the error message 
> and allows the error message to be printed correctly with no hang.
> 
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
> ---
> This problem affects many boards.
> 
> Maybe a global fix is to add a CONFIG_SYS_PBSIZE entry into config_fallbacks
> and remove its definition from the board config files when it is defined as:
> #define CONFIG_SYS_PBSIZE (CONFIG_SYS_CBSIZE + sizeof(CONFIG_SYS_PROMPT) + 16)
> 

IMHO this is much better as fixing each single board.

> or even when it is equal to CONFIG_SYS_CBSIZE.

I would not add any further check : if a board maintainer add
CONFIG_SYS_PBSIZE to each own config file, he must know what he is
doing. If it is not set, config_fallbacks defines CONFIG_SYS_PBSIZE

Regards,
Stefano

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