On Wed, 3 Apr 2024 at 23:40, Richard Henderson <richard.hender...@linaro.org> wrote: > > On 4/3/24 08:15, Gautam Bhat wrote: > > Here simple_test.bin is the raw binary file converted using objcopy. > > addr=0xFFFE is the vector location where the PC will load with the > > starting address. > > > > Now how do I load the address in that reset vector location and set my > > PC? Is there some example code that I can look at? > > Hmm. I can't find an example. I see a TODO for m68k which *should* be > loading the pc > from the reset vector on reset.
Arm M profile does this. > The loader device populates ram during the reset hold phase, so I believe you > need to wait > until after that is complete to perform the load, thus the reset_exit hook. This will not work (yet) -- CPUs do not get reset as part of the whole-system three-phase-reset, so using the exit phase method is not sufficient to avoid the reset ordering problem here. You need to use rom_ptr_for_as() to see if there's a ROM blob at the address you're trying to load the PC from, and if there is you use ldl_p() to get the PC from the blob; otherwise you use ldl_phys(). Searching for "initial_pc" in target/arm/cpu.c will find you the code that does this for M-profile. thanks -- PMM
