> On Apr 1, 2015, at 2:27 PM, Narinder Dhillon <ndhillo...@gmail.com> wrote:
>
> Hi All,
>
> I add a boot option for PXE boot, pointed to a network interface, and boot
> from it successfully. If I update my firmware, flash into spi-nor device and
> then try pxe boot again, fails.
> If I now delete the old boot option in boot manager and add a new one, then
> PXE boot works.
>
> I have chased this down to a comparison in
> MdeModulePkg/Core/Dxe/Hand/Locate.c and in function CoreLocateDevicePath, the
> following comparison fails even though the device path strings look the same.
>
> ----------------------------------------------------------------------------------------------------------------
> if ((Size <= SourceSize) && CompareMem (SourcePath, TmpDevicePath,
> (UINTN) Size) == 0) {
> ----------------------------------------------------------------------------------------------------------------
>
> I used the device path to text protocol to print both paths and they look the
> same but I am not sure why this comparison is failing.
>
> Tmp Device Path 'PciRoot(0x2)/Pci(0x2,0x0)/Pci(0x0,0x0)/MAC(123456789ABC,0x1)'
>
> Source Device Path
> 'PciRoot(0x2)/Pci(0x2,0x0)/Pci(0x0,0x0)/MAC(123456789ABC,0x1)'
>
The text representation of a device path is a summary. The compare is done on
the actual device path binary. The device paths are binary bits with no
strings. The strings are just convention to make things human readable. So
hexdump the device paths to see the difference.
Thanks,
Andrew Fish
> Any suggestions on how I can debug this ?
> Thanx,
>
>
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