Date: Tue, 17 Nov 1998 20:19:59 +0000 From: "Paolo Di Francesco" <paipai@tin.it> To: freebsd-sparc@FreeBSD.ORG Subject: Porting process (Again) Message-ID: <19981117191824.ELKO23830.fep03-svc@winworkstation>
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Step #1) Read docs about the booting process, and do experiments on it.
This means we need to write some asm code and do some unusefull things, such as
to print on the screen "Hello world". I can do it on i386 using a floppy. This
mean I can boot ANYTHING from the floppy. (Well, I loaded an image directly
from the boot sector). The same thing will happen under Sparc.
This will improve the asm skill...
Step #2) Choose a version to start from. (Maybe 3.0?)
Step #3) Isolate the asm (i386) code from the FreeBSD kernel code. This mean :
Step #3.1) Isolate the asm directory and then the asm source files. Many of the
directories have no asm code, so we need concentrate on the dirs which HAVE asm
code. Then, in these dirs many files have no asm code. And so on. So a document
with a tree like
sys ----+
+-> dir #1 Nothing to modify
+-> dir #2 + Here some asm files
+-> file #1 to rewrite (partially)
+-> file #2 to rewrite (totally)
and so on...
Step #3.2) Understand priority. What we need NOW to boot... For example we do
not need "low priority" files which are not usefull for the first kernel
version.
Step #4) configure the base kernel and compile it under i386. This means that
when we have well understood which files we need and which not, we can try to
delete all unecessary files from the /usr/src/sys dir and then try to compile
it under i386. This configuration will be the "starting point".
Step #n-1) Write the device dependent code. Controller, network cards, misc
cards, and so on.
...
...
...
Step #n) write the code and compile it.... (Good Luck!)
Ciao Ciao
Paolo Di Francesco
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