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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>
25 lines
807 B
Plaintext
25 lines
807 B
Plaintext
if ARM64
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config ARMV8_MULTIENTRY
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boolean "Enable multiple CPUs to enter into U-Boot"
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config ARMV8_SPIN_TABLE
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bool "Support spin-table enable method"
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depends on ARMV8_MULTIENTRY && OF_LIBFDT
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help
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Say Y here to support "spin-table" enable method for booting Linux.
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To use this feature, you must do:
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- Specify enable-method = "spin-table" in each CPU node in the
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Device Tree you are using to boot the kernel
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- Let secondary CPUs in U-Boot (in a board specific manner)
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before the master CPU jumps to the kernel
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U-Boot automatically does:
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- Set "cpu-release-addr" property of each CPU node
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(overwrites it if already exists).
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- Reserve the code for the spin-table and the release address
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via a /memreserve/ region in the Device Tree.
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endif
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