Re: [XenARM] Problems when booting on OMAP5432 devboard

[Chen Baozi <baozich@xxxxxxxxx>]

On Mon, Jul 01, 2013 at 01:39:02PM +0100, Ian Campbell wrote:
> On Mon, 2013-07-01 at 20:32 +0800, Chen Baozi wrote:
> > On Jul 1, 2013, at 8:06 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > 
> > > On Mon, 2013-07-01 at 20:00 +0800, Chen Baozi wrote:
> > > 
> > >>> You device has 2GB RAM, what happens if you hack the DTS to say it only
> > >>> has 1GB?
> > >> 
> > >> Bingo! Compared to Arndale board, OMAP5432 uEVM's RAM is not yet 
> > >> 0x40000000~0xbfffffff, but 0x80000000~0xffffffff. After make the 
> > >> following change to DTS:
> > >> 
> > >>  memory {
> > >>          device_type = "memory"
> > >> -                reg = <0x80000000 0x80000000>; /* 2 GB */
> > >> +                reg = <0x80000000 0x40000000>; /* 1 GB */
> > >>  };
> > >> 
> > >> I can reach the output "Xen heap: 131072 pages  Dom heap: 131072 pages". 
> > > 
> > > Excellent!
> > > 
> > > So I guess if you keep the 2GB but put it at the right address it will
> > > also work?
> > 
> > I'm afraid no, :-(
> > 
> > Here is how I load and boot the image both in 1GB case and 2G case (from 
> > u-boot):
> > 
> > OMAP5430 EVM # fatload mmc 0 0x80000000 xen-uImage
> > reading xen-uImage
> > 902572 bytes read in 59 ms (14.6 MiB/s)
> > OMAP5430 EVM # bootm 0x80000000 -
> > ## Booting kernel from Legacy Image at 80000000 ...
> >    Image Name:
> >    Image Type:   ARM Linux Kernel Image (uncompressed)
> >    Data Size:    902508 Bytes = 881.4 KiB
> >    Load Address: 80200000
> >    Entry Point:  80200000
> >    Verifying Checksum ... OK
> >    Loading Kernel Image ... OK
> > OK
> 
> > And I've also tried "fat load mmc 0 0x90000000 xen-uImage" in both
> > cases. It works for 1GB but fails in 2GB case too.
> 
> What is the base address of RAM on the A31 SoC?

A31 SoC? I use OMAP5432 ES2.0 uEVM (OMAP5 Panda) board.

The attachment is the dts file which the linux kernel uses on this board by
default, which the memory line is:

        reg = <0x80000000 0x80000000>; /* 2 GB */

> I don't have a DTS for
> an A31 system but all arch/arm/boot/dts/sun* (which covers A10 and A13 I
> think) have it at 0x40000000. Which means that *if* your system has 2GB
> then the correct memory line is:
>               reg = <0x40000000 0x80000000>; /* 2 GB */
> 
> Ian.
> 
>

Attachment: omap5-panda.dts
Description: audio/vnd.dts

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