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README.fsl-ddr

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      e750cfaa
      powerpc/mpc8xxx: Enable entering DDR debugging by key press · e750cfaa
      York Sun authored
      
      Using environmental variable "ddr_interactive" to activate interactive DDR
      debugging seomtiems is not enough. For example, after updating SPD with a
      valid but wrong image, u-boot won't come up due to wrong DDR configuration.
      By enabling key press method, we can enter debug mode to have a chance to
      boot without using other tools to recover the board.
      
      CONFIG_FSL_DDR_INTERACTIVE needs to be defined in header file. To enter the
      debug mode by key press, press key 'd' shortly after reset, like one would
      do to abort auto booting. It is fixed to lower case 'd' at this moment.
      
      Signed-off-by: default avatarYork Sun <yorksun@freescale.com>
      Signed-off-by: default avatarAndy Fleming <afleming@freescale.com>
      e750cfaa
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      powerpc/mpc8xxx: Enable entering DDR debugging by key press
      York Sun authored
      
      Using environmental variable "ddr_interactive" to activate interactive DDR
      debugging seomtiems is not enough. For example, after updating SPD with a
      valid but wrong image, u-boot won't come up due to wrong DDR configuration.
      By enabling key press method, we can enter debug mode to have a chance to
      boot without using other tools to recover the board.
      
      CONFIG_FSL_DDR_INTERACTIVE needs to be defined in header file. To enter the
      debug mode by key press, press key 'd' shortly after reset, like one would
      do to abort auto booting. It is fixed to lower case 'd' at this moment.
      
      Signed-off-by: default avatarYork Sun <yorksun@freescale.com>
      Signed-off-by: default avatarAndy Fleming <afleming@freescale.com>