From: manu <manuel.pezzin@free.fr>
To: Linuxppc-embedded@ozlabs.org
Subject: problems to boot 2.6.23 kernel on XILINX ppc with 8Mbytes of RAM
Date: Wed, 24 Oct 2007 22:01:15 +0200 [thread overview]
Message-ID: <471FA48B.2020809@free.fr> (raw)
Hello,
I work on a custom board based on a virtex 2 pro FPGA and 8Mbytes of SDRAM.
Untill now I used a 2.4.31 linux ppc kernel with John Williams patches
and uclinux distribution and everything worked perfectly.
I've decided to move to the latest 2.6 version from kernel.org
(2.6.23.1) with an initramfs containing a busybox.
My complete zImage including the initramfs has a size of 900Kbytes.
I made some tests with a ML300 board and I managed to get a shell easily.
When I migrated to the custom board, I had the "Now booting the kernel"
message and then nothing.
When I trace the code running on the ppc with the debugger, execution
seems to be stuck in some early initialization code.
I managed to reproduce the problem on the ML300 using "mem=8m" parameter
on the bootline.
With "mem=16m" the kernel boots correctly.
I'm really surprised by the amount of RAM required to boot the kernel.
Is there a way to make it boot with only 8Mbytes of RAM ?
Thanks for your help.
Manu
next reply other threads:[~2007-10-24 20:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-24 20:01 manu [this message]
2007-10-25 7:00 ` problems to boot 2.6.23 kernel on XILINX ppc with 8Mbytes of RAM Magnus Hjorth
2007-10-26 18:43 ` manu
2007-10-26 19:54 ` Grant Likely
2007-10-27 8:35 ` [PATCH] ppc4xx: mmu_mapin_ram bugfix for booting with mem<16 MB Magnus Hjorth
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