Re: [Buildroot] Adding USB support to existing device on 2.6.39.3 kernel - possible?

[Dan Jackson <dan@thejacksons.uk>]

> -----Original Message-----
> From: Andreas Ziegler <br015@umbiko.net>
> Sent: 30 March 2022 08:14
> To: Dan Jackson <dan@thejacksons.uk>
> Cc: buildroot@buildroot.org
> Subject: Re: Adding USB support to existing device on 2.6.39.3 kernel -
> possible?
> 
> Hi Dan,
> 
> cutting some old content.
> 
> On 2022-03-29 19:19, Dan Jackson wrote:
> 
> <cut>
> 
> >> > However, now I have a new missing file error, and I can't seem to
> >> > locate a suitable candidate:
> >> >
> >> > In file included from
> >> > /home/danj/buildroot-2022.02/output/build/linux-
> >> custom/arch/arm/include/asm/system.h:165,
> >> >                  from
> >> > /home/danj/buildroot-2022.02/output/build/linux-
> >> custom/arch/arm/include/asm/bitops.h:27,
> >> >                  from include/linux/bitops.h:22,
> >> >                  from include/linux/kernel.h:17,
> >> >                  from include/linux/sched.h:55,
> >> >                  from arch/arm/kernel/asm-offsets.c:13:
> >> > /home/danj/buildroot-2022.02/output/build/linux-
> >> custom/arch/arm/include/asm/memory.h:19:10:
> >> > fatal error: mach/memory.h: No such file or directory
> >> >    19 | #include <mach/memory.h>
> >> >       |          ^~~~~~~~~~~~~~~
> >> > compilation terminated.
> >> > /home/danj/buildroot-2022.02/output/build/linux-custom/./Kbuild:81:
> >> > recipe for target 'arch/arm/kernel/asm-offsets.s' failed
> >> > make[3]: *** [arch/arm/kernel/asm-offsets.s] Error 1
> >> > Makefile:1009: recipe for target 'prepare0' failed
> >> > make[2]: *** [prepare0] Error 2
> >> > make[2]: *** Waiting for unfinished jobs....
> >> >   HOSTCC  scripts/mod/modpost.o
> >> >   HOSTCC  scripts/mod/sumversion.o
> >> >   HOSTLD  scripts/mod/modpost
> >> > make[2]: *** wait: No child processes. Stop.
> >> > package/pkg-generic.mk:289: recipe for target
> >> > '/home/danj/buildroot-2022.02/output/build/linux-
> custom/.stamp_built'
> >> > failed
> >> > make[1]: ***
> >> > [/home/danj/buildroot-2022.02/output/build/linux-custom/.stamp_buil
> >> > t]
> >> > Error 2
> >> > Makefile:84: recipe for target '_all' failed
> >> > make: *** [_all] Error 2
> >>
> >> This seems not to be the defconfig from above? It now uses
> >> linux-custom ...
> >> The failure may be due to the default kernel configuration. Try to
> >> configure the correct one and see if you get further.
> >>
> >> > I think maybe I am still doing something wrong because it sure
> >> > seems to be compiling a lot of stuff instead of letting me configure
> things.
> >>
> >> It gets better once everything necessary is built.
> >
> > Still no luck I'm afraid. Same error with mach/memory.h as above.
> >
> > Buildroot defconfig now looks like this:
> >
> > BR2_armeb=y
> > BR2_STATIC_LIBS=y
> > BR2_KERNEL_HEADERS_VERSION=y
> > BR2_DEFAULT_KERNEL_VERSION="2.6.39.3"
> > BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_REALLY_OLD=y
> > BR2_TOOLCHAIN_BUILDROOT_LOCALE=y
> > BR2_PTHREAD_DEBUG=y
> > BR2_BINUTILS_VERSION_2_37_X=y
> > BR2_GCC_VERSION_9_X=y
> > BR2_TOOLCHAIN_BUILDROOT_CXX=y
> > BR2_PACKAGE_HOST_GDB=y
> > BR2_GDB_VERSION_9_2=y
> > BR2_LINUX_KERNEL=y
> > BR2_LINUX_KERNEL_CUSTOM_VERSION=y
> > BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="2.6.39.3"
> > BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
> >
> BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="/home/danj/DG3270_9.1.103
> FB/sourcecode/ti_linux/linux-2.6.39.3/src/.config"
> > BR2_PACKAGE_DROPBEAR=y
> >
> BR2_PACKAGE_DROPBEAR_LOCALOPTIONS_FILE="/home/danj/localoptions
> .h"
> > BR2_PACKAGE_JOE=y
> >
> > I forgot to mention this before but the buildroot manual page you
> > mentioned said to create a local.mk file in order to use external
> > source, this looks like this:
> >
> > LINUX_OVERRIDE_SRCDIR =
> > /home/danj/DG3270_9.1.103FB/sourcecode/ti_linux/linux-2.6.39.3/src/
> >
> > For the kernel configuration I entered the kernel source dir and did
> > "make menuconfig", I left everything at the defaults except for
> > enabling the USB related items.
> >
> > The resulting configuration file is attached as a text file.
> > Unfortunately it's been literally decades since I last actually
> > compiled a kernel, so I'm afraid I have no idea what bits would be
> > suitable to disable/remove to get the results I want (I'm guessing
> > this will be the most likely way to eliminate the error I'm getting?)
> 
> I did a compile test this morning, the Buildroot version was some early
> 2022.02 version, not up-to-date.
> 
> You have a potential header mismatch, Select Toolchain -> Kernel Headers
> -> Same as kernel being built to use the vendor source also for the
> headers.
> 
> I could configure Linux with make menuconfig, did not encounter the
> missing memory.h error above, but the build stops during Linux kernel
> compilation with this error:
> 
> /tmp/ccSO8f6S.s: Assembler messages:
> /tmp/ccSO8f6S.s:950: Error: .err encountered
> make[3]: *** [scripts/Makefile.build:284:
> arch/arm/kernel/sys_oabi-compat.o] Error 1
> make[2]: *** [Makefile:969: arch/arm/kernel] Error 2
> make[1]: *** [package/pkg-generic.mk:292:
> /home/data/test/buildroot/output/build/linux-custom/.stamp_built] Error
> 2
> make: *** [Makefile:84: _all] Error 2
> 
> Full error log is here: https://pastebin.com/VrXqSVsD

Looking at the error log, it seems like vfp has been selected? But my target device only has Features: swp half thumb fastmult edsp java.

Also, OABI does not seem like it is the correct ABI. For example, if I run "file" against the busybox binary the device comes with, I get:

busybox: ELF 32-bit MSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-uClibc.so.0, stripped

> 
> You might now do some research:
> 
> https://stackoverflow.com/questions/61235299/gcc-8-3-arm-assembly-
> error-when-building-linux-kernel-3-14-17-in-buildroot-2020
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85745
> 
> or try to switch to an older compiler ...
> 
> --
> Andreas
> 
> <cut>
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