Hi there
I'm building u-boot as payload for x86 platform. I didn't enable device tree in 
menuconfig (CONFIG_OF_CONTROL is not set) because I use a board config file 
coreboot.h. When I built u-boot, it reports error during linking stage : 
undefined reference to dm_scan_fdt_dev

arch/x86/lib/built-in.o:(.u_boot_list_2_uclass_2_lpc+0x8): undefined reference 
to `dm_scan_fdt_dev'
common/built-in.o:(.u_boot_list_2_uclass_2_usb_hub+0x8): undefined reference to 
`dm_scan_fdt_dev'
drivers/built-in.o:(.u_boot_list_2_uclass_2_pch+0x8): undefined reference to 
`dm_scan_fdt_dev'
drivers/pci/built-in.o:(.u_boot_list_2_uclass_2_pci+0x8): undefined reference 
to `dm_scan_fdt_dev'
drivers/spi/built-in.o:(.u_boot_list_2_uclass_2_spi+0x8): undefined reference 
to `dm_scan_fdt_dev'
drivers/usb/host/built-in.o:(.u_boot_list_2_uclass_2_usb+0x8): more undefined 
references to `dm_scan_fdt_dev' follow
Makefile:1189: recipe for target 'u-boot' failed

I looked at the code and see arch/x86/lib/lpc-uclass.c refers to a function 
"dm_scan_fdt_dev " which is defined in drivers/core/root.c and it looks like a 
device tree function


UCLASS_DRIVER(lpc) = {
        .id             = UCLASS_LPC,
        .name           = "lpc",
        .post_bind      = dm_scan_fdt_dev,
};

Because device tree isn't enabled, the function isn't compiled and causes the 
problem while linking.
It's only compiled when the following is true
#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
If I comment out the line, it would compile and build. But I'm not sure if it's 
the right way to do it.

Is it normal behavior? I thought that when not enabling device tree, the code 
shouldn't use device tree function?
Can anyone help on this please?


Thanks alot,
Chi


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