[U-Boot] Beginners Questions on modding a NAS

[Jagan Teki]

Hi JPT,

On Mon, Mar 4, 2013 at 9:10 PM, JPT <j-p-t at gmx.net> wrote:
> Hi,
>
> I've got a NAS which uses uboot:
> U-Boot 1.1.4 (Feb  6 2012 - 14:40:46) Marvell version: 3.4.27
>
> It's a Netgear ReadyNAS Duo V2, and the original sofware sucks. ;)
>
> I would like to start with the original kernel (because it contains some
> patches) and a custom debian made with multistrap.
>
> Where do I start?
>
> I'll add some information about the config.
>
> I believe these are the most important boot options.
>
> standalone=fsload 0x2000000 $(image_name);setenv bootargs $(console)
> root=/dev/mtdblock0 rw ip=$(ipaddr):$(serverip)$(bootargs_end)
> $(mvPhoneConfig); bootm 0x2000000;
>
> bootcmd=nand read.e 0x1200000 0x200000 0x600000;nand read.e 0x2000000
> 0x800000 0x1000000;bootm 0x1200000 0x2000000
>
> bootargs=console=ttyS0,115200 reason=normal
> mtdparts=nand_mtd:0x180000 at 0(u-boot),0x20000 at 0x180000(u-boot-env),0x600000 at 0x200000(uImage),0x1000000 at 0x800000(minirootfs),0x6800000 at 0x1800000(jffs2);
>
>
> there are 5 mtds:
> 1,5M mtd0 - ?
> 128K mtd1 - ?
> 6,0M mtd2 - kernel
> 2,2M mtd3 - initrd (gzipped)
>  89M mtd4 - jffs2 image, I think it contains a rescue image of the
> filesystem which is applied to the harddisks.
>
> I dumped the kernel from mtd2, it is:
> u-boot legacy uImage, Linux-2.6.31.8.duov2, Linux/ARM, OS Kernel Image (Not
> compressed), 3442208 bytes, Tue Aug 28 05:21:43 2012, Load Address:
> 0x00008000, Entry Point: 0x00008000, Header CRC: 0xDA1ECA31, Data CRC:
> 0x269C27DE
>
>
> I tried to load the kernel through tftp, but it crashed:
>
> Marvell>> dhcp
>
> BOOTP broadcast 1
> *** Unhandled DHCP Option in OFFER/ACK: 28
> *** Unhandled DHCP Option in OFFER/ACK: 28
> DHCP client bound to address 192.168.20.35
> Marvell>> set serverip 192.168.20.24
>
> Marvell>> tftpboot 0x02000000 /boot/kernel.img
>
> Using egiga0 device
> TFTP from server 192.168.20.24; our IP address is 192.168.20.35
> Filename '/boot/kernel.img'.
> Load address: 0x2000000
> Loading: #################################################################
> ...
> done
> Bytes transferred = 3442272 (348660 hex)
> Marvell>> go  0x02000000

Is this load address for kernel is correct? likely to have 8000 multiples..
check it once.

>
> ## Starting application at 0x02000000 ...
> software interrupt
> pc : [<0200001c>]          lr : [<00633cac>]
> sp : 005fef68  ip : ffffffff     fp : 005ff7de
> r10: 005ff3de  r9 : ffffe804     r8 : 005fffcc
> r7 : 005ff388  r6 : 00000001     r5 : 005ff38c  r4 : 02000000
> r3 : 30383101  r2 : f1012000     r1 : 005ff38c  r0 : c0c0e0c4
> Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
> Resetting CPU ...

Try to debug the value from pc.
Use the pc value using the instructions from doc/README.arm-unaligned-accesses

Thanks,
Jagan.

>
>
> thanks for any help,
>
> JPT
>
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