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6b6024eadb
There are two enable methods supported by ARM64 Linux; psci and
spin-table. The latter is simpler and helpful for quick SoC bring
up. My main motivation for this patch is to improve the spin-table
support, which allows us to boot an ARMv8 system without the ARM
Trusted Firmware.
Currently, we have multi-entry code in arch/arm/cpu/armv8/start.S
and the spin-table is supported in a really ad-hoc way, and I see
some problems:
- We must hard-code CPU_RELEASE_ADDR so that it matches the
"cpu-release-addr" property in the DT that comes from the
kernel tree.
- The Documentation/arm64/booting.txt in Linux requires that
the release address must be zero-initialized, but it is not
cared by the common code in U-Boot. We must do it in a board
function.
- There is no systematic way to protect the spin-table code from
the kernel. We are supposed to do it in a board specific manner,
but it is difficult to predict where the spin-table code will be
located after the relocation. So, it also makes difficult to
hard-code /memreserve/ in the DT of the kernel.
So, here is a patch to solve those problems; the DT is run-time
modified to reserve the spin-table code (+ cpu-release-addr).
Also, the "cpu-release-addr" property is set to an appropriate
address after the relocation, which means we no longer need the
hard-coded CPU_RELEASE_ADDR.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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| .. | ||
| ashldi3.S | ||
| ashrdi3.S | ||
| asm-offsets.c | ||
| bootm-fdt.c | ||
| bootm.c | ||
| cache-cp15.c | ||
| cache-pl310.c | ||
| cache.c | ||
| ccn504.S | ||
| cmd_boot.c | ||
| crt0.S | ||
| crt0_64.S | ||
| debug.S | ||
| div0.c | ||
| div64.S | ||
| eabi_compat.c | ||
| gic_64.S | ||
| interrupts.c | ||
| interrupts_64.c | ||
| interrupts_m.c | ||
| lib1funcs.S | ||
| lshrdi3.S | ||
| Makefile | ||
| memcpy.S | ||
| memset.S | ||
| muldi3.S | ||
| relocate.S | ||
| relocate_64.S | ||
| reset.c | ||
| sections.c | ||
| semihosting.c | ||
| spl.c | ||
| stack.c | ||
| uldivmod.S | ||
| vectors.S | ||
| vectors_m.S | ||