On 2/13/22 09:09, Ovidiu Panait wrote:
A user exception is triggered by inserting a bralid/brki jump to "C_BASE_VECTORS+0x8" in the software flow. Because u-boot microblaze code does not deal with MMU-related features such as user-mode/privileged-mode separation, there are no code sequences that call into the user exception handler. It seems there is no real usecase for having user exception support in u-boot, so drop the code that installs the nop handler.
U-Boot still supports to run user code on the top of u-boot which doesn't need to handle these kind of exceptions. That's why it is good to jump to this code and let you know about it.
M
