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CNTFRQ_EL0 is only writable from the highest supported exception level on the platform. For Armv8-A, this is typically EL3, but technically EL2 and EL3 are optional so it may need to be initialized at EL2 or EL1. For Armv8-R, the highest exception level is always EL2. This patch moves the initialization outside of the switch_el block and uses a new macro branch_if_not_highest_el which dynamically detects whether it is at the highest supported exception level. Linux's docs state that CNTFRQ_EL0 should be initialized by the bootloader. If not set, the the U-Boot prompt countdown hangs. Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com> |
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| arm11 | ||
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| arm920t | ||
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| arm946es | ||
| arm1136 | ||
| arm1176 | ||
| armv7 | ||
| armv7m | ||
| armv8 | ||
| pxa | ||
| sa1100 | ||
| Makefile | ||
| u-boot-spl.lds | ||
| u-boot.lds | ||