RK3588 bootrom function

All cores in all clusters will be brought up on boot.

All cores but core 0 will enter a wfe loop waiting to be sent to an address.

if (mpidr_el1 & 0xffff) != 0 {
    ((uint32_t)0xffff00e0)[0] = 1;
    while (((uint32_t)0xffff00e0)[0] != 0xdeadbeaf) {
        __asm__("wfe");
    }
    typedef core_entry();
    core_entry *entry = (core_entry *)(uintptr_t)(((uint32_t)0xffff00e8)[0]);
    entry();
}
boot();

boot()

The main boot function does a lot of stuff, mostly with undocumented mmio registers:

• ddrphy
• cru
• crypto
• saradc

After that it runs through a loop bringing up and trying various storage devices looking for one with a valid rockchip signature.

1. FSPI 0
2. FSPI 1
3. FSPI 2
4. FSPI 3
5. FSPI 4
6. FSPI 6
7. eMMC
8. sdmmc

Between probing each device, it will try 2 different iomux combinations.

If no bootable medium is found, it will bring up a dwc3 gadget on USB3OTG_0.

• Once a bootable medium is found, it will load the ddr image from it into sram call it, then load the OS image into dram and run that.
• Both images are booted into as EL3 in aarch64 mode.