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x86: doc: Remove stale sections of 64-bit support
There are some sections in current doc saying 64-bit is unsupported. This apparently is out of date. Remove it. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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@ -1160,27 +1160,10 @@ to load a 'u-boot-payload.efi', see below test logs on QEMU.
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See README.u-boot_on_efi and README.uefi for details of EFI support in U-Boot.
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64-bit Support
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--------------
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U-Boot supports booting a 64-bit kernel directly and is able to change to
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64-bit mode to do so. However, U-Boot itself is currently always built
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in 32-bit mode. Some access to the full memory range is provided with
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arch_phys_memset().
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The development work to make U-Boot itself run in 64-bit mode has not yet
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been attempted. The best approach would likely be to build a 32-bit SPL
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image for U-Boot, with CONFIG_SPL_BUILD. This could then handle the early CPU
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init in 16-bit and 32-bit mode, running the FSP and any other binaries that
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are needed. Then it could change to 64-bit model and jump to U-Boot proper.
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Given U-Boot's extensive 64-bit support this has not been a high priority,
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but it would be a nice addition.
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TODO List
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---------
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- Audio
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- Chrome OS verified boot
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- Building U-Boot to run in 64-bit mode
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References
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----------
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