Hello everyone,
This is my first post here, so appoligies if I seem a bit naive about what I'm asking...
I'm looking to port Linux to a SC250 based custom board and the first thing I need to do is get a bootloader which will support booting linux operational.
So far, U-Boot looks to be the closest match to my needs. I had a look at RedBoot, but found the build documentation to be very lacking.
My build environment is as follows: - Ubuntu 8.04 (i86_32) - gcc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7) - GNU Make 3.81 - Eclipse Version: 3.2.2
It does not look to me that there is an EDLK supporting the i86 architecture, so I am trying to use the native build environment in Ubuntu.
I downloaded U-Boot 1.3.4, copied u-boot-1.3.4/board/sc520_cdp/ and u-boot-1.3.4/include/configs/sc520_cdp.h and edited Makefile and MAKEALL
After performing a make config and make all, quite a few errors were reported by the compiler. A number of these seem to be a result of gcc 4.2.3 being very pedantic, while others seem to stem from the i86 arch in U-Boot still being somewhat immature (which I am not taking exception to at all as I realise i86 is not as common as the others in the embedded world).
I had a look at the latest git snapshot (last change 22nd August 2008) but it didn't seem to solve any of the build problems.
A few problems I have solved with the help of trawling through the mailing lists. for example:
[U-Boot-Users] [PATCH] 82550_eeprom: Fix error: lvalue required as increment operand http://lists.denx.de/pipermail/u-boot/2008-May/034312.html http://lists.denx.de/pipermail/u-boot/2008-May/034313.html
** Is the suggestion posted in http://lists.denx.de/pipermail/u-boot/2008-May/034392.html a better solution? **
[PATCH] fix for DECLARE_GLOBAL_DATA_PTR on i386 http://lists.denx.de/pipermail/u-boot/2006-July/015766.html
** Is there an issue with this fix, being that it is so old? There does not appear to be further discussion on this, but a later fix (http://lists.denx.de/pipermail/u-boot/2008-May/034325.html) seemed to raise some concerns **
[Local Changes] Removed __const__ from declarations in u-boot-1.3.4/include/asm-i386/byteorder.h
I am more than willing to have a go at fixing the remaining issues, but I would like to be sure that I am not replicating anyone elses work, treading on anyones toes, or creating code that is incompatible with the mainline tree.
A few quick questions: - Am I using a completely unsupported build environment ? - Should I be looking at using another version / snapshot (v2 does not seem to have i86 support yet)? - Is there a custodian for the i86 acrchitecture that I should be talking to? - Has anyone collated a list of i86 build issues and fixes? - If nobody else has, should I have a go at getting 1.3.4 building in my build environemt and feeding the changes back here? - If nobody else is actively maintaining i86, should I perhaps look at getting a custodian repository?
Regards,
Graeme