When bootstrapping ourselves on the fly at runtime (via "go"), we need to
turn off the caches to avoid taking software exceptions. Since caches
need CPLBs and CPLBs need exception handlers, but we're about to rewrite
the code in memory where those exception handlers live, we need to turn
off caches first.
This new code also encourages a slight code optimization by storing the
MMR bases in dedicated registers so we don't have to fully load up the
pointer regs multiple times.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
The length of the sections is fixed at link time, so let the linker do the
calculation rather than doing it ourselves at runtime.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
When testing a u-boot binary that hasn't been booted from the bootrom, we
have to make sure the bootstruct structure has sane storage space. If we
don't, the initcode will crash when it tries to dereference an invalid
pointer.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
When initializing the core clocks, stick external memory into self-refresh.
This gains us a few cool things:
- support suspend-to-RAM with Linux
- reprogram clocks automatically when doing "go" on u-boot.bin in RAM
- make sure settings are stable before flashing new version
- finally fully unify initialize startup code path between LDR/non-LDR
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
People often ask questions about the init process and when things go
from flash to relocated base, so clarify the comments a bit.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Use the sti instruction to set the initial interrupt mask rather than
banging on the core IMASK MMR to save both space and time.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
During cpu init, make sure we initialize the CEC properly so that
interrupts can fire and be handled while U-Boot is running.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
All of the duplicated code for Blackfin processors and boot modes have been
unified. After all, the core is the same for all processors, just the
peripheral set differs (which gets handled in the drivers).
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Mike Frysinger
Peter Tyser
Jean-Christophe PLAGNIOL-VILLARD