[U-Boot-Users] mpc8260 serial console works under uboot, but not under linux
Stephan Linz
linz at mazet.de
Tue Mar 14 16:54:24 CET 2006
Am Dienstag, 14. März 2006 16:28 schrieb jfaslist:
> Hi,
> We have ported u-boot on a mpc8260 based design of ours.
> We try to boot linux on it (built with TQM8260_defconfig), as a
> first step. But when we use the u-boot "bootm" command to boot
> linux from flash, we get nothing displayed after the kernel is
> uncompressed and jumped into.
Hi,
is there a VGA adapter in your system with linux driver support enabled? If
yes, you have to use the kernel parameter 'console=device,options' to use a
serial port as console ... see linux/Documentation/serial-console.txt
best regards,
Stephan Linz
> I know there is a FAQ:
> http://www.denx.de/wiki/view/DULG/LinuxHangsAfterUncompressingKernel
> But I don't think it applies as using the BDI2000 we can trace
> the kernel running all the way until around the point where it
> starts the init process.
> We were surprised to see that a "make uImage" would use the
> vmlinux.gz kernel (linked at 0xc000.0000) and not the
> zImage.elf(linked at 0x0040.0000), which includes the files in
> arch/ppc/boot/simple.
> The serial console is initialized and handled in
> ./arch/ppc/boot/simple/m8260_tty.c, and we suspect that since
> this is not included in vmlinux, that is the reason why we don't
> see any messages.
> Should we try to somehow add it to vmlinux (if this is possible)?
>
> I know this is not the list, but why is the linux make file is
> generating these two different files? My guess is that zImage is
> for systems with no u-boot bootloader.
> Thanks a lot,
> -jf simon
>
>
>
> [bmc at Linux188 linux-2.6.15.1]$ make
> CHK include/linux/version.h
> CHK include/linux/compile.h
> CHK usr/initramfs_list
> UIMAGE arch/ppc/boot/images/uImage
> Image Name: Linux-2.6.15.1
> Created: Tue Mar 14 07:01:49 2006
> Image Type: PowerPC Linux Kernel Image (gzip compressed)
> Data Size: 869873 Bytes = 849.49 kB = 0.83 MB
> Load Address: 0x00000000
> Entry Point: 0x00000000
> Image: arch/ppc/boot/images/uImage is ready
> AS arch/ppc/boot/simple/head.o
> AS arch/ppc/boot/simple/relocate.o
> CC arch/ppc/boot/simple/misc-embedded.o
> CC arch/ppc/boot/simple/embed_config.o
> arch/ppc/boot/simple/embed_config.c:29: warning: 'bdinfo' defined
> but not used
> arch/ppc/boot/simple/embed_config.c:415: warning: 'clk_8260'
> defined but not use
> d
> arch/ppc/boot/simple/embed_config.c:457: warning: 'clk_8280'
> defined but not use
> d
> CC arch/ppc/boot/simple/m8260_tty.o
> ppc_6xx-objcopy -O elf32-powerpc \
> --add-section=.image=arch/ppc/boot/images/vmlinux.gz \
>
> --set-section-flags=.image=contents,alloc,load,readonly,data \
> arch/ppc/boot/simple/dummy.o arch/ppc/boot/simple/image.o
> ppc_6xx-ld -m elf32ppc -T
> /home/bmc/tools/eldk4.0/ppc_6xx/usr/src/linux-2.6.15.1
> /arch/ppc/boot/ld.script -Ttext 0x00400000 -Bstatic -o
> arch/ppc/boot/simple/zvml
> inux arch/ppc/boot/simple/head.o arch/ppc/boot/simple/relocate.o
> arch/ppc/boot/s
> imple/misc-embedded.o arch/ppc/boot/simple/embed_config.o
> arch/ppc/boot/simple/m
> 8260_tty.o arch/ppc/boot/simple/image.o
> arch/ppc/boot/common/lib.a arch/ppc/boot
> /lib/lib.a
> ppc_6xx-objcopy -O elf32-powerpc arch/ppc/boot/simple/zvmlinux
> arch/ppc/boot/sim
> ple/zvmlinux -R .comment -R .stab \
> -R .stabstr -R .ramdisk
> cp -f arch/ppc/boot/simple/zvmlinux arch/ppc/boot/images/zImage.elf
> rm -f arch/ppc/boot/simple/zvmlinux
> Building modules, stage 2.
> MODPOST
> [bmc at Linux188 linux-2.6.15.1]$
>
>
>
>
>
>
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--
Mit freundlichen Gruessen
Stephan Linz
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pub 1024D/958C74A7 2004-08-04 Stephan Linz <linz at mazet.de>
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