[U-Boot] U-Boot X86 bootstart

[Ondra Kupka]

Hello,

I've been digging a bit in X86 bootstart asm code and found possibly wrong
code, as far as I understand:

In u-boot/arch/x86/cpu/start.S, there is piece of code to disable caches:

    /* Turn of cache (this might require a 486-class CPU) */
    movl    %cr0, %eax
    orl     $(X86_CR0_NW | X86_CR0_CD), %eax
    movl    %eax, %cr0
    wbinvd

, which perfectly makes sense to me. What doesn't really make sense then is:

    /* Turn of cache (this might require a 486-class CPU) */
    movl    %cr0, %eax
    orl     $(X86_CR0_NW & X86_CR0_CD), %eax    - AND HERE???
    movl    %eax, %cr0
    wbinvd

in start16.S of the same directory.

Is is wrong or not?

Thanks a lot,
Ondrej Kupka