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由 Bjorn Andersson 提交于
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: NStephen Boyd <sboyd@codeaurora.org> Signed-off-by: NBjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: NAndy Gross <andy.gross@linaro.org>
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