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4 RISC-V Kernel Boot Requirements and Constraints
10 This document describes what the RISC-V kernel expects from bootloaders and
19 The RISC-V kernel expects the following of bootloaders and platform firmware:
24 The RISC-V kernel expects:
32 The RISC-V kernel expects:
39 The RISC-V kernel must not map any resident memory, or memory protected with
46 The RISC-V kernel expects to be placed at a PMD boundary (2MB aligned for rv64
53 The firmware can pass either a devicetree or ACPI tables to the RISC-V kernel.
71 support older firmwares without SBI HSM extension and M-mode RISC-V kernel.
75 booting the RISC-V kernel because it can support CPU hotplug and kexec.
83 When booting with UEFI, the RISC-V kernel will use only the EFI memory map to
96 it to the RISC-V kernel in ``$a1``. The EFI stub retrieves the boot hartid using
108 The RISC-V kernel's early boot process operates under the following constraints:
120 The installation of the virtual mapping is done in 2 steps in the RISC-V kernel:
147 ``setup_vm_final()``, the RISC-V kernel uses the fixmap region to map the