On Mon, Aug 26, 2024 at 11:42:44AM +0200, Stefan Kalkowski wrote: > > I have checked bits and pieces. I believe that irq 30 is the timer > > according to the manual. The gic should work , it did on RK3588. > > Not sure if they are critical , but both is 0x1. > > ICC_IGRPEN0_EL1 > > ICC_IGRPEN1_EL1 > > > > > > > > Just a shot in the dark: you told us that you stepped from EL3 to EL2 > > > in u-boot?! Maybe you just switched the exception-level without > > > further preparation of additional peripherals (like GIC) normally done > > > by the TrustZone firmware? > > > I assume that the GIC's default register values are initialized in > > > a way that interrupts are marked "secure", and thereby cannot be > > > enabled by the normal world resp. the hw kernel then. One way to proof > > > this would be to lookup the Igroup registers of the GIC's redistributor > > > interface while the CPU is still in EL3 (shortly before switching to > > > EL2). > > > > Do you refer to the above regs? If I need to access GIC memory mapped > > I need somes extra code. > > No, the ICC_IGREN* register belong to the cpu local interface of the > GIC. What I meant are global ones that belong to the GIC's > redistributor interface. > In general the GIC's memory mapped I/O registers are accessed already > within the Hw::Pic constructor within > `repos/base-hw/src/bootstrap/spec/arm/gicv3.cc`. The constructor is > used explicitly within the EL2 codepath of the > `Bootstrap::Platform::enable_mmu()` for Cortex A53. If you really > start in EL3, at least part of that code should be executed in EL3. In > that case, you could duplicate the Pic initialization before entering > `prepare_non_secure_world` as a first try.
I have to correct myself. We already initialize the Pic alias Gicv3 within EL3 (if booting to it), as well as in EL2. In EL2 this is done explicitly within `Bootstrap::Platform::enable_mmu()` asstated before. But in general, it is done within `Bootstrap::Platform::Board::Board()`, which is executed before `enable_mmu` (in EL3 if booted in EL3). -- Stefan Kalkowski Genode labs https://github.com/skalk | https://genode.org _______________________________________________ users mailing list -- users@lists.genode.org To unsubscribe send an email to users-le...@lists.genode.org Archived at https://lists.genode.org/mailman3/hyperkitty/list/users@lists.genode.org/message/3PCXA2O3YOU346PHWEYL56YB4QC2U6UO/
