From mboxrd@z Thu Jan  1 00:00:00 1970
From: Timur Tabi <timur@freescale.com>
Date: Fri, 16 Sep 2011 14:15:04 -0500
Subject: [U-Boot] [u-boot-release] [Patch v3 7/7] powerpc/8xxx: Add
 support for interactive DDR programming interface
In-Reply-To: <1316190465-11186-1-git-send-email-yorksun@freescale.com>
References: <1316190465-11186-1-git-send-email-yorksun@freescale.com>
Message-ID: <4E73A038.8030201@freescale.com>
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York Sun wrote:
> +Interactive DDR debugging
> +===========================
> +
> +For DDR parameter tuning up and debugging, the interactive DDR debugging can
> +be activated by saving an environment variable "ddr_interactive". The value
> +doesn't matter. Once activated, U-boot prompts "FSL DDR>" before enabling DDR
> +controller. The available commands can be seen by typing "help".
> +
> +The example flow of using interactive debugging is
> +type command "compute" to calculate the parameters from the default
> +type command "print" with arguments to show SPD, options, registers
> +type command "edit" with arguments to change any if desired
> +type command "go" to continue calculation and enable DDR controller
> +
> +Note, check "next_step" to show the flow. For example, after editing registers,
> +DDR controller will be enabled with current setting without further
> +calculation.

This is pretty skimpy for such a powerful feature.  How about some examples and
a detailed description of each command?

-- 
Timur Tabi
Linux kernel developer at Freescale