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diff --git a/tip22/README b/tip22/README new file mode 100644 index 0000000..becc313 --- /dev/null +++ b/tip22/README @@ -0,0 +1,32 @@ +How to create the boot image: +----------------------------------- + +tip22 <vmlinux> <initrd> <outputfile> +tip32 <vmlinux> <initrd> <outputfile> + +- vmlinux is an ELF Linux kernel. For versions before 2.6.9 you need to + apply an extra patch for correct commandline parsing, see + /usr/share/doc/tip22/examples. +- initrd is the gzip compressed initial ramdisk you want add +- outputfile is the bootimage. It is in ECOFF format for ip22 and in + ELF format for ip32. You can for example tfpboot this image on an SGI + Indy using the bootp(): command in the prom. + +it basically works like this: +----------------------------- +- tftpload.o is a relocatable object created during package build time +- the tip22 script converts the ramdisk and vmlinux to relocatable + objects using linker scripts including symbols that mark the begin + and the end of kernel and ramdisk +- those are linked together into the output file using yet another + linker script +- when executed by the prom the embedded loader: + - memcopies the kernel to its loadaddress + - memcopies the initrd after the kernel to a page boundary + - parses the command line and everything within an append="..." + statement is passed on to the kernel, e.g. + 'bootp(): append="console=ttyS0"' + - jumps into the kernel passing the start address and size of the + initrd on the command line + + -- Thu, 15 May 2002 23:07:18 +0200 Guido Guenther <agx@sigxcpu.org> |