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Intel Quark SoC has a low end x86 processor with only 400MHz frequency. Currently it takes about 15 seconds for U-Boot to boot to shell and the most time consuming part is with MRC, which is about 12 seconds. MRC programs lots of registers on the SoC internal message bus indirectly accessed via pci bus. To speed up the boot, create an optimized version of pci config read/write dword routines which directly operate on PCI I/O ports. These two routines are inlined to provide better performance too. Now it only takes about 3 seconds to finish MRC, which is really fast (4 times faster than before). Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org> |
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| sh | ||
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| x86 | ||
| .gitignore | ||
| Kconfig | ||