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Re: [Xen-devel] xen on beagleboard-x15: fails to access PRCM MPU register
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Iain Hunter <drhunter95@xxxxxxxxx>, Hunyue Yau <hy-gsoc@xxxxxxxxxxxxxxx>
- From: Denis Obrezkov <denisobrezkov@xxxxxxxxx>
- Date: Thu, 27 Jun 2019 22:10:01 +0200
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- Delivery-date: Thu, 27 Jun 2019 20:10:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
CC'ed other GSoC mentors
On 6/27/19 9:52 PM, Denis Obrezkov wrote:
> Hello all,
>
> I have a failure when I am trying to boot Linux with Xen on bb-x15, here
> is the log:
> https://pastebin.com/BBAFPkVU
>
> and, as Julien (cc'ed) suggested here is the DT debug information for xen:
> https://drive.google.com/open?id=15YTsCKYUTbG2i-siWezJXKWuG0H1VfQz
>
> So, what I was able to figure out:
> In omap4_prminst_read_inst_reg it tries to read from _prm_bases[part].va
> (arch/arm/mach-omap2/prminst44xx.c).
> _prm_bases[part].va has a value of prm_base or prcm_mpu_base depending
> on part value(arch/arm/mach-omap2/prminst44xx.c:44)
> Failure happens when _prm_bases[OMAP4430_PRCM_MPU_PARTITION] is read.
> It's value set up in arch/arm/mach-omap2/prcm_mpu44xx.c:54.
> The installed value is obtained with OMAP_L4_IO_ADDRESS macro
> (mach_omap2/io.c:667). Here is its definition (arch/arm/mach_omap2/iomap.h):
> #define OMAP2_L4_IO_OFFSET 0xb2000000
> #define OMAP2_L4_IO_ADDRESS(pa) IOMEM((pa) + OMAP2_L4_IO_OFFSET) /* L4 */
>
> and IOMEM (arch/arm/include/asm/io.h):
> #define IOMEM(x) ((void __force __iomem *)(x))
>
> I don't understand what is happening and how to overcome it.
>
--
Regards, Denis Obrezkov
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