[Bug 205889] New: CONFIG_PPC_85xx with CONFIG_CORENET_GENERIC outputs uImage instead of zImage

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=205889

            Bug ID: 205889
           Summary: CONFIG_PPC_85xx with CONFIG_CORENET_GENERIC outputs
                    uImage instead of zImage
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 5.5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-32
          Assignee: platform_ppc-32 at kernel-bugs.osdl.org
          Reporter: bradley.gamble at ncipher.com
        Regression: No

Attempting a PowerPC Linux kernel build with the config options
"CONFIG_PPC_85xx=y" and "CONFIG_CORENET_GENERIC=y" will output a file named
"zImage", however this file is actually a "uImage" formatted file.

This can be replicated with this minimal defconfig:
    CONFIG_PPC_85xx=y
    CONFIG_CORENET_GENERIC=y

If I perform a build with one of these options I am given a valid zImage file:
    $ file arch/powerpc/boot/zImage
    arch/powerpc/boot/zImage: ELF 32-bit MSB executable, PowerPC or cisco 4500,
version 1 (SYSV), statically linked, not stripped

However performing the same build with both config options enabled gives an
incorrectly formatted image:
    $ file arch/powerpc/boot/zImage
    arch/powerpc/boot/zImage: u-boot legacy uImage, Linux-5.5.0-rc2-gea200dec5,
Linux/PowerPC, OS Kernel Image (gzip), 1366142 bytes, Tue Dec 17 15:30:22 2019,
Load Address: 0x00000000, Entry Point: 0x00000000, Header CRC: 0x99D350A0, Data
CRC: 0xC9090D33

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