[linuxsh-dev] Configurable Command Line (parameter block?)

[NIIBE Y. <gn...@m1...>]

Jeremy Siegel wrote:
 > Rather than the entire parameter block we copy only the kernel command
 > line, made configurable (with a copy in misc.c itself so zImage is still
 > built w/o the empty_zero_page).  This allows kernel config to force the
 > command line regardless of the bootloader, or to not have one and depend
 > on the bootloader as now.  (Or to use sh-ipl+g to load w/o having to set
 > up the command line using gdb commands.)

I think it's good idea to have hard-coded default parameters, and make
them configurable.  I don't think it's good to "force" the parameters.
It should be overridden at run-time.

 > (Note that the following patch also includes code in misc.c to display
 > the "Uncompressing Linux..." message w/o the SH BIOS, though it's now
 > under Solution Engine config flags only.)

This part is OK for me.  Perhaps, using another config option would be
good (CONFIG_SERIAL_CONSOLE and someting), instead of target machine.

Besides, for the implementation of default parameters for zImage, 
I think it could be implemented the file(s) under arch/sh/boot/.

 > --- kernel/arch/sh/kernel/head.S	Fri Jul 27 04:48:29 2001
 > +++ test/arch/sh/kernel/head.S	Tue Sep  4 14:13:49 2001

I think touching beyond arch/sh/boot/ is irrelevant for this purpose.

How about following?

  (a) Introduce parameter block something like David Woodhouse suggested.
  (b) Provide the config option to build "zImage + parameter block",
      say, zImage+parms, and provide options for default paremeters
      to build parameters block.

Users can use zImage+parms with no boot loader, use zImage with boot
loader, or use zImage+parms with boot loader which may override params
at run-time.
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