1. 12 Oct, 2017 1 commit
    • Bjorn Andersson's avatar
      firmware: qcom: scm: Expose download-mode control · 8c1b7dc9
      Bjorn Andersson authored
      In order to aid post-mortem debugging the Qualcomm platforms provide a
      "memory download mode", where the boot loader will provide an interface
      for custom tools to "download" the content of RAM to a host machine.
      
      The mode is triggered by writing a magic value somewhere in RAM, that is
      read in the boot code path after a warm-restart. Two mechanism for
      setting this magic value are supported in modern platforms; a direct SCM
      call to enable the mode or through a secure io write of a magic value.
      
      In order for a normal reboot not to trigger "download mode" the magic
      must be cleared during a clean reboot.
      
      Download mode has to be enabled by including qcom_scm.download_mode=1 on
      the command line.
      Reviewed-by: default avatarStephen Boyd <sboyd@codeaurora.org>
      Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
      Signed-off-by: default avatarAndy Gross <andy.gross@linaro.org>
      8c1b7dc9
  2. 23 Nov, 2016 1 commit
  3. 12 Jun, 2016 1 commit