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- U-boot for arm64
- Summary
- =======
- No hardware platform of arm64 is available now. The u-boot is
- simulated on Foundation Model and Fast Model for ARMv8.
- Notes
- =====
- 1. Currenly, u-boot run at the highest exception level processor
- supported and jump to EL2 or optionally EL1 before enter OS.
- 2. U-boot for arm64 is compiled with AArch64-gcc. AArch64-gcc
- use rela relocation format, a tool(tools/relocate-rela) by Scott Wood
- is used to encode the initial addend of rela to u-boot.bin. After running,
- the u-boot will be relocated to destination again.
- 3. Fdt should be placed at a 2-megabyte boundary and within the first 512
- megabytes from the start of the kernel image. So, fdt_high should be
- defined specially.
- Please reference linux/Documentation/arm64/booting.txt for detail.
- 4. Spin-table is used to wake up secondary processors. One location
- (or per processor location) is defined to hold the kernel entry point
- for secondary processors. It must be ensured that the location is
- accessible and zero immediately after secondary processor
- enter slave_cpu branch execution in start.S. The location address
- is encoded in cpu node of DTS. Linux kernel store the entry point
- of secondary processors to it and send event to wakeup secondary
- processors.
- Please reference linux/Documentation/arm64/booting.txt for detail.
- 5. Generic board is supported.
- 6. CONFIG_ARM64 instead of CONFIG_ARMV8 is used to distinguish aarch64 and
- aarch32 specific codes.
- Contributor
- ===========
- Tom Rini <trini@ti.com>
- Scott Wood <scottwood@freescale.com>
- York Sun <yorksun@freescale.com>
- Simon Glass <sjg@chromium.org>
- Sharma Bhupesh <bhupesh.sharma@freescale.com>
- Rob Herring <robherring2@gmail.com>
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