stm32mp1: add a function to check boot is from serial device
This function will return true if the platform has booted from UART or USB, false if it booted from a storage device. Change-Id: I427f87cb3005c337b878430d2d484fb43236d5ea Signed-off-by:Yann Gautier <yann.gautier@st.com> Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/tf-a/+/188655 Reviewed-by:
CITOOLS <smet-aci-reviews@lists.codex.cro.st.com> Reviewed-by:
Sebastien PASDELOUP <sebastien.pasdeloup-ext@st.com> Tested-by:
Sebastien PASDELOUP <sebastien.pasdeloup-ext@st.com>
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