RedBoot linux exec for i386

[Ian Campbell <icampbell at arcom dot com>]

Hi,

The attached patch adds a function 'linux' to RedBoot under i386. This
is similar to the 'exec' command on arm. It is based on the arm code and
a previous patch which I made. On arm 'exec' is not Linux specific, but
it is on i386 -- hence the different name.

The command will launch a Linux zImage or bzImage from memory by copying
it to the correct location, setting up some data areas and jumping to
the start of the protected mode kernel.

The reason I setup the data area and jump directly to the protected mode
kernel entry is that the data area is normally setup by the real mode
stub, but setup.S requires BIOS support which is not available when
booting via RedBoot. 

The patch should apply cleanly to CVS eCos in the ecos/packages
directory with "patch -p0 -i linux.i386.diff"
Ian.

-- 
Ian Campbell
Design Engineer

Arcom Control Systems Ltd,			Direct: +44 (0)1223 403465
Clifton Road,					Phone:  +44 (0)1223 411 200
Cambridge CB1 7EA				E-Mail: icampbell at arcom dot com
United Kingdom					Web:    http://www.arcom.com




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Attachment: linux.i386.diff
Description: Text document