How to change CCSRBAR in T2080 CPU

[ryudaejin]

Dear friends,

I'm using T2080 CPU and using boot loader povided by vxworks.

I'm booting normally with the following bootloader settings:
- Flash1: 0xFF00_0000~0xFFFF_FFFF (16MB)
- Bootloader: 0xFFF0_0000~ 0xFFFF_FFFF (1MB, boot ROM)
- CCSBAR: 0xFE00_0000~ 0xFEFF_FFFF (16MB, default address)

My board has more size of Flash1.  So I'm trying to remap Flash1.

However, with the following settings, the boot fails.

- Flash1: 0xFE00_0000~0xFFFF_FFFF (48MB)
- boot loader: 0xFFF0_0000~ 0xFFFF_FFFF (1MB, boot rom)
- CCSBAR: 0xFE00_0000~ 0xFEFF_FFFF (16MB)

I think the problem is caused by overlapping CCSBAR.

However, even after setting CCSBAR to 0xFD00_0000, the boot still fails.

Please let me know how can I change the CCSBAR.

(It's listed in T2080 RM 4.3.11 but I'm not sure what it means.)

[June_Lu]

Yes, it seems start code could relocate it, maybe you could refer the source below

https://github.com/nxp-qoriq/u-boot/blob/f3363c060497515ca8b71451cb56f3ec0abacaa9/arch/powerpc/cpu/m...

[June_Lu]

I am sorry, the official code is SDK2.0, no such example for modifying the CCSRBAR.

Since the CCSR impacts numerous registers, if you change its address, please ensure that all related source code has been properly updated to reflect this change.

[ryudaejin]

Dear June_Lu,

If you look at the NXP community forum, you'll see that someone previously solved the same problem as me. The title and date are below.

* CCSRBAR Relocate issue in T2080 Processor. by karunakaranradh at 01-31-2017.

The reply references the U-boot source code as below

* Freescale PowerPC u-boot Tree

However, I can't access the references.

Is there a way to access the references?

[June_Lu]

Where do you set the CCSR, is it follow the rule of T2080 RM, page 177, guidelines?

Could you access the CCSR registers after the changing the LAW? It seems CCSR registers access should also be changed, see the RM Table 2-5.

[ryudaejin]

First of all, thank you for your additional response.

The boot loader is changing the CCSR (0xFE00_0000 -> 0xFD00_0000), but since the boot process is not working, I cannot confirm whether the CCSR register is accessible.

For CCSR configuration, I use 'vxbl-1.0.4.1' provided by VXWorks7(by windriver).

When CCSRBAR=0xFE00_0000, the boot process is normal. However, when CCSRBAR set to 0xFD00_0000, the boot process does not work.

CCSRBAR shouldn't overlap with the flash area, right?

Are there any examples or publicly available code for changing CCSRBAR? (I'll have to compare it with VXBL.)

[June_Lu]

In the QorIQ® SDK 2.0-1703 Documentation, will use LAW to setting the specific address.

The link below may related to the LAW, maybe you could refer it.

https://github.com/nxp-qoriq/u-boot/blob/f3363c060497515ca8b71451cb56f3ec0abacaa9/board/freescale/t2...

https://github.com/nxp-qoriq/u-boot/blob/f3363c060497515ca8b71451cb56f3ec0abacaa9/arch/powerpc/inclu...

Thanks

[ryudaejin]

Thanks for your reply.

However, I have already modified the TLB and LAW sizes in the boot loader to match the changed flash size.