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2206ac248a
At present PCI auto-configuration happens in U-Boot both before and after relocation. This is a waste of time and may mess up static addresses used in board_init_f(). Adjust the code to supporting doing auto-configuration once, after relocation, under control of a device-tree property. This is needed for Apollo Lake for debugging the silicon-init code. Once the UART is moved to a different MMIO address the debug UART does not work and any debug output in Apollo Lake's arch_fsp_init_r() causes a hang. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
24 lines
772 B
Text
24 lines
772 B
Text
x86 PCI DT details:
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===================
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Some options are available to affect how PCI operates on x86.
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Optional properties:
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- u-boot,skip-auto-config-until-reloc : Don't set up PCI configuration until
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after U-Boot has relocated. Normally if PCI is used before relocation,
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this happens before relocation also. Some platforms set up static
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configuration in TPL/SPL to reduce code size and boot time, since these
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phases only know about a small subset of PCI devices.
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Example:
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pci {
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compatible = "pci-x86";
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#address-cells = <3>;
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#size-cells = <2>;
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u-boot,dm-pre-reloc;
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ranges = <0x02000000 0x0 0xc0000000 0xc0000000 0 0x10000000
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0x42000000 0x0 0xb0000000 0xb0000000 0 0x10000000
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0x01000000 0x0 0x1000 0x1000 0 0xefff>;
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u-boot,skip-auto-config-until-reloc;
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};
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