what does "Synchronous exception from Current EL with SP_ELx" mean?

In here : https://chromium.googlesource.com/external/github.com/ARM-software/arm-trusted-firmware/+/v0.4-rc1/docs/firmware-design.md#bl1-architectural-initialization The arm-tf B1 code sets the LED...
what does "Synchronous exception from Current EL with SP_ELx" mean?

In here : https://chromium.googlesource.com/external/github.com/ARM-software/arm-trusted-firmware/+/v0.4-rc1/docs/firmware-design.md#bl1-architectural-initialization The arm-tf B1 code sets the LED...
What does the word UNPREDICTABLE exactly mean and what is its effect on the system?

Hi, In many of ARM documentation result of operations are reported as unpredictable in some situations. For example, "If the system includes the Security Extensions, accesses to CNTVOFF from Secure Monitor...
What does the word UNPREDICTABLE exactly mean and what is its effect on the system?

Hi, In many of ARM documentation result of operations are reported as unpredictable in some situations. For example, "If the system includes the Security Extensions, accesses to CNTVOFF from Secure Monitor...
What does the XTAL directive really mean?

I am confused by the documentation. It states in the "Getting Started" book that the XTAL [directive in the Target dialog] specifies the CPU clock for my device. "In most cases this value is inentical...