path: root/Documentation/sparc/README-2.5
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authorAnton Arapov <>2012-08-07 11:21:50 +0200
committerAnton Arapov <>2012-08-07 12:52:25 +0200
commit1d44b6f3fcf6058fb7c960b7558766967e8028f7 (patch)
tree53d88547c973ba048d233091a3f91f3173ad01df /Documentation/sparc/README-2.5
parentd91eda5d7b0383e6a0c83e0146ff141ff3b1355b (diff)
fedora kernel: 222b075b3ff0d9e88aa9353e3c80667756ed7361v3.5.0-4
Signed-off-by: Anton Arapov <>
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-To build new kernels you have to issue "make image". The ready kernel
-in ELF format is placed in arch/sparc/boot/image. Explanation is below.
-BTFIXUP is a unique feature of Linux/sparc among other architectures,
-developed by Jakub Jelinek (I think... Obviously David S. Miller took
-part, too). It allows to boot the same kernel at different
-sub-architectures, such as sun4c, sun4m, sun4d, where SunOS uses
-different kernels. This feature is convinient for people who you move
-disks between boxes and for distrution builders.
-To function, BTFIXUP must link the kernel "in the draft" first,
-analyze the result, write a special stub code based on that, and
-build the final kernel with the stub (btfix.o).
-Kai Germaschewski improved the build system of the kernel in the 2.5 series
-significantly. Unfortunately, the traditional way of running the draft
-linking from architecture specific Makefile before the actual linking
-by generic Makefile is nearly impossible to support properly in the
-new build system. Therefore, the way we integrate BTFIXUP with the
-build system was changed in 2.5.40. Now, generic Makefile performs
-the draft linking and stores the result in file vmlinux. Architecture
-specific post-processing invokes BTFIXUP machinery and final linking
-in the same way as other architectures do bootstraps.
-Implications of that change are as follows.
-1. Hackers must type "make image" now, instead of just "make", in the same
- way as s390 people do now. It is analogous to "make bzImage" on i386.
- This does NOT affect sparc64, you continue to use "make" to build sparc64
- kernels.
-2. vmlinux is not the final kernel, so RPM builders have to adjust
- their spec files (if they delivered vmlinux for debugging).
- generated for vmlinux is still valid.
-3. Scripts that produce a.out images have to be changed. First, if they
- invoke make, they have to use "make image". Second, they have to pick up
- the new kernel in arch/sparc/boot/image instead of vmlinux.
-4. Since we are compliant with Kai's build system now, make -j is permitted.
--- Pete Zaitcev