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From: | Thomas Huth |
Subject: | Re: [PATCH] hw/ppc/ppc405_boards: Change kernel load address |
Date: | Fri, 3 Dec 2021 11:31:21 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 |
On 03/12/2021 11.27, Cédric Le Goater wrote:
On 12/2/21 20:32, LEROY Christophe wrote:Le 02/12/2021 à 20:19, Cédric Le Goater a écrit :On 12/2/21 20:17, Thomas Huth wrote:On 02/12/2021 20.14, Cédric Le Goater wrote:The default addresses to load the kernel, fdt, initrd of AMCC boards in U-Boot v2015.10 are : "kernel_addr_r=1000000\0" "fdt_addr_r=1800000\0" "ramdisk_addr_r=1900000\0" The taihu is one of these boards, the ref405ep is not but we don't have much information on it and both boards have a very similar address space layout. Change the kernel load address to match U-Boot expectations and fix loading.You could additionally mention that U-Boot corrupts the kernel if it gets loaded to address 0.True. The first word is overwritten with zeros. I looked for it in the code but could not find the reason.Isn't it because U-boot unzips the kernel at address 0 ?Address 0 is trashed before U-boot loads the kernel.
I guess it's an accidential NULL pointer dereference somewhere in the u-boot code ... which will be quite hard to track down when the first page of memory is marked as writable... :-/
Thomas
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