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a187559e | 1 | U-Boot for arm64 |
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2 | |
3 | Summary | |
4 | ======= | |
a187559e | 5 | No hardware platform of arm64 is available now. The U-Boot is |
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6 | simulated on Foundation Model and Fast Model for ARMv8. |
7 | ||
8 | Notes | |
9 | ===== | |
10 | ||
a187559e | 11 | 1. Currenly, U-Boot run at the highest exception level processor |
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12 | supported and jump to EL2 or optionally EL1 before enter OS. |
13 | ||
a187559e | 14 | 2. U-Boot for arm64 is compiled with AArch64-gcc. AArch64-gcc |
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15 | use rela relocation format, a tool(tools/relocate-rela) by Scott Wood |
16 | is used to encode the initial addend of rela to u-boot.bin. After running, | |
a187559e | 17 | the U-Boot will be relocated to destination again. |
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18 | |
19 | 3. Fdt should be placed at a 2-megabyte boundary and within the first 512 | |
20 | megabytes from the start of the kernel image. So, fdt_high should be | |
21 | defined specially. | |
22 | Please reference linux/Documentation/arm64/booting.txt for detail. | |
23 | ||
24 | 4. Spin-table is used to wake up secondary processors. One location | |
25 | (or per processor location) is defined to hold the kernel entry point | |
26 | for secondary processors. It must be ensured that the location is | |
27 | accessible and zero immediately after secondary processor | |
28 | enter slave_cpu branch execution in start.S. The location address | |
29 | is encoded in cpu node of DTS. Linux kernel store the entry point | |
30 | of secondary processors to it and send event to wakeup secondary | |
31 | processors. | |
32 | Please reference linux/Documentation/arm64/booting.txt for detail. | |
33 | ||
34 | 5. Generic board is supported. | |
35 | ||
36 | 6. CONFIG_ARM64 instead of CONFIG_ARMV8 is used to distinguish aarch64 and | |
37 | aarch32 specific codes. | |
38 | ||
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39 | |
40 | ||
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41 | Contributor |
42 | =========== | |
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43 | Tom Rini <trini@ti.com> |
44 | Scott Wood <scottwood@freescale.com> | |
45 | York Sun <yorksun@freescale.com> | |
46 | Simon Glass <sjg@chromium.org> | |
47 | Sharma Bhupesh <bhupesh.sharma@freescale.com> | |
48 | Rob Herring <robherring2@gmail.com> | |
49 | Sergey Temerkhanov <s.temerkhanov@gmail.com> |