I'm writing a standalone application that uses a non-GPL compatible library,
so I have to be careful not to derive from GPL code.
I've modified (and will release under the GPL) u-boot sources to export more
u-boot functions to the jump table, including get_ipaddr, do_dcache,
get_config_start,
ip_to_string, do_jffs2_fsload, do_bootm. My application downloads files from
a server using u-boot's tftp functions (via jump table), does some stuff, then
boots.
Q1: Is this allowed? Can I add other u-boot functions to the jump table and
call
them from my standalone application w/o encumbering my application
with the GPL?
Q2: About which specific include files may be included in a standalone app...
The COPYING file explicitly calls out include/image.h and
include/asm-*/u-boot.h:
NOTE! This copyright does *not* cover the so-called "standalone"
applications that use U-Boot services by means of the jump table
provided by U-Boot exactly for this purpose - this is merely
considered normal use of U-Boot, and does *not* fall under the
heading of "derived work".
The header files "include/image.h" and "include/asm-*/u-boot.h"
define interfaces to U-Boot. Including these (unmodified) header
files in another file is considered normal use of U-Boot, and does
*not* fall under the heading of "derived work".
Also note that the GPL below is copyrighted by the Free Software
Foundation, but the instance of code that it refers to (the U-Boot
source code) is copyrighted by me and others who actually wrote it.
-- Wolfgang Denk
But it does not mention examples/stubs.c, which is required I believe to
use the jump table. I think there are other includes which are needed to
build a meaningful standalone application, including common.h and exports.h.
My app directly includes the following, unmodified files:
examples/stubs.c (linked with)
include/common.h
include/exports.h
include/net.h
include/linux/string.h
and those indirectly include:
include/config.h
include/asm/bitops.h
include/asm/byteorder.h
include/asm/global_data.h
include/asm/mach-types.h
include/asm/posix_types.h
include/asm/proc/ptrace.h
include/asm/ptrace.h
include/asm/setup.h
include/asm/string.h
include/asm/types.h
include/asm/u-boot-arm.h
include/asm/u-boot.h
include/cmd_confdefs.h
include/command.h
include/_exports.h
include/flash.h
include/ide.h
include/image.h
include/linux/bitops.h
include/linux/byteorder/generic.h
include/linux/byteorder/little_endian.h
include/linux/byteorder/swab.h
include/linux/config.h
include/linux/posix_types.h
include/linux/stddef.h
include/linux/types.h
include/part.h
Is such an standalone application still not considered a derived work?
I'm looking for an authoritative answer, hopefully from Herr Denk.
Thanks. --ed
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