linux requires EL1,however uboot is in EL3 mode.linux is halted.
dudu8,
U-Boot should not be attempting to boot the kernel at EL3 if you're just using commands like "bootm" or "bootz" to execute the kernel image. The answer, really, is that U-Boot should be switching from EL3 to EL1 (or EL2) automatically, for you.
Are you asking how U-Boot changes exception levels (out of curiosity) or does your U-Boot simply branch to the kernel at the current exception level? Your screenshots don't make much sense: both instructions are completely valid at EL3. Are these U-Boot "screenshots" or Linux?
What exactly is your question related to?
Ta,
Matt