Hello everyone,
This patch series creates a generic set of functions available to generic
code which can be easily hooked per-architecture or per-board. I have
tried to be very careful that U-Boot builds and runs on all architectures
for the entire duration of this patchset.
This patchset is designed to produce zero change in behavior *except* for
one particular scenario: Platforms which perform a "restart" with a simple
jump to the "_start" entrypoint (or similar) will no longer try to do that
on panic().
The new functions to be called from generic code are:
int system_restart(void)
void emergency_restart(void)
The specific platform hooks available are:
int __arch_restart(void)
int __board_restart(void)
void __arch_emergency_restart(void)
void __board_emergency_restart(void)
The first few patches set up the generic functions and hooks with a default
fallback to the existing "do_reset()" function. Most of the rest are then
architecture-specific modifications necessary to convert away from the old
do_reset() prototype. The last patch finally does away with that function.
In my previous discussions with Wolfgang Denk about the __arch_restart()
hook he requested that it should be mandatory for all architectures to
implement. Unfortunately the MIPS and MicroBlaze architectures have no
architectural system-reset code at all, and others have only very limited
"soft-reboot" (IE: Jump-to-"_start").
Specifically, the MIPS do_reset() function used to look like this:
_machine_restart();
printf("*** restart failed ***\n");
When those platforms are fixed then it should be safe to remove the weak
fallback __arch_restart() function.
Cheers,
Kyle Moffett
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