TMS320F28P550SG: Problem with CMAC and CPU1BROM_calculateCMAC in custom Bootloader

Marco Schlüter

Part Number: TMS320F28P550SG
Other Parts Discussed in Thread: UNIFLASH, C2000WARE

Tool/software:

Hello guys,

I have a problem with the function call stated above (CPU1BROM_calculateCMAC) and do need some assistance.

I do have a secure boot project currently done via emulation boot and as the bootloader is > 16kB the mem region reserved for the bootloader ix 0x80000 to 0x83FFF. Therefore I added a function CMAC_check_do_application_code_check that calls CPU1BROM_calculateCMAC with 0x80000, 0x84000 and 0x00083F00 for the CMAC tag all done according to https://www.ti.com/lit/an/spract3/spract3.pdf?ts=1717693001038.

We started the project with the new P55 device and have boards with samples (labeled XF28P550SJ9PZ) where the code runs fine. Now we got the final controller (labeled FS28P550SG8PZ) and the code execution breaks:

The emulated secure boot seems to work, I already added the dummy reads to 0x78018... CMACKEYs prior to calling the bootrom function CPU1BROM_calculateCMAC. But as soon as I single step into the function (lcr 0x3f402b) the controller seems to do a reset and the debugger states "no source available for _system_post_cinit()" with the programm counter beeing 0x3FEEAE.

Any advice would be appreciated.

Thanks in advance,

Marco

4 months ago

0 Kedar_Sirdeshpande 4 months ago

TI__Expert 3370 points

Hi Marco.

Can you clarify if the issue is related to secure boot or single stepping?

If Secure boot works fine and the single stepping does not, it is an expected behavior. Let me look at the difference in behaviour between devices and let you know in about a week.

-Kedar

0 Marco Schlüter 4 months ago in reply to Kedar_Sirdeshpande

Prodigy 110 points

Hi Kedar,

I do Secure boot only via emulator: Emulation boot (recommended for example/development). In CCS memory window, set BOOTPINCONFIG location (0x0D00) to 0x5AFFFFFF and BOOTDEF location (0x0D04) to 0x0000000A. And that seems to work as I do get to my init code within the main function and can single step from thereon.

When I do a "normal" boot to flash start with the target I do see that it is resetting all the time. Once I do remove the call to the function doing the dummy read and the call to CPU1BROM_calculateCMAC the controller starts fine.

Marco

0 Kedar_Sirdeshpande 4 months ago in reply to Marco Schlüter

TI__Expert 3370 points

Hi Marco,

One primary concern I see here is that you are attempting dummy reads on the DCSM. The ROM does that by itself. Why is it being done manually here? Also, the Dummy read offsets are mapped using the link pointer, but I do not see any reference of that in your main issue.

Can you please elaborate?

-Kedar

0 Marco Schlüter 4 months ago in reply to Kedar_Sirdeshpande

Prodigy 110 points

Hi Kedar,

I deducted the need to do a dummy read from https://www.ti.com/lit/an/spract3/spract3.pdf?ts=1717693001038 chapter 9 where is stated: Similarly, if using the CMAC Authentication APIs without running the secure flash boot mode on CPU1, then a
dummy load must be performed from CPU1 for the Z1 OTP CMACKEY before calling the APIs.

But it makes no difference as the controller has the same behaviour and does a reset all the time with the FS28P550SG8PZ controller but not with the XF28P550SJ9PZ controller.

Without the dummy reads I still get the reset when calling CPU1BROM_calculateCMAC and doing the step over or having a breakpoint after that code.

Marco

0 Kedar_Sirdeshpande 3 months ago in reply to Marco Schlüter

TI__Expert 3370 points

Can you share the complete OTP data for both devices?

-Kedar

0 Marco Schlüter 3 months ago in reply to Kedar_Sirdeshpande

Prodigy 110 points

Hi,

via TI Uniflash I read out the following OPT mem ranges:

0x72000-0x725FF

0x74000-0x745FF

0x78000-0x781FF

Please let me know if you need any other informations.

TI_OTP_B0_and_B2_DCSM_B0_Z1_and_DCSM_B0_Z2_P5SG8.hex:

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TI_OTP_B0_and_B2_DCSM_B0_Z1_and_DCSM_B0_Z2_P5SJ9.hex:

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0 Marco Schlüter 3 months ago in reply to Marco Schlüter

Prodigy 110 points

Hi Kedar,

any news about this issue. Any advise or hint would be appreciated.

Kind regards, Marco

0 Marco Schlüter 3 months ago in reply to Marco Schlüter

Prodigy 110 points

Hi Kedar,

I have received the following answer from the product group:

"In early silicon (X-devices) this protection mechanism was not present, but is normal for RTM devices. I think customer is using same binary for both DSPs. Can he recompile the project for the new device? The symbols are different. The production samples have a hardware security fix that requires a new set of symbols. The release package should have everything, you find it in the C2000Ware which should has all the symbol libraries."

Unfortunately that does not help me totally:

I am indeed flashing the same file into an SG8 RTM device and and SJ9 X-device. I compiled the project for an SG8 controller in mind (i.e. for example sparing the non existent flash sections). I don’t see any more differences where I could compile for an SG8 device instead of an SJ9 device. I’m linking the F28P55x_SecureZoneCodeSymbols_fpu32.lib library from C2000Ware V.5.05 (located at C:\ti\c2000\C2000Ware_5_05_00_00\libraries\boot_rom\f28p55x\rev0\rom_symbol_libs\SafeZoneCode) and it states the CPU1BROM_calculateCMAC is abs fixed at address 0x003f402b.

So how do I get new symbols? And what symbols exactly are you talking about?

Kind regards, Marco

0 Kedar_Sirdeshpande 3 months ago in reply to Marco Schlüter

TI__Expert 3370 points

Hi Marco,

There is an address change in the production samples for the secure CMAC operation. The older symbols had an address which if accessed directly from the non secure zone would cause a reset.

/cfs-file/__key/communityserver-discussions-components-files/171/F28P55x_5F00_SecureZoneCodeSymbols_5F00_fpu32.lib /cfs-file/__key/communityserver-discussions-components-files/171/F28P55x_5F00_SecureZoneCodeSymbols.lib

Can you try linking with these symbols and let me know?

You need to be calling CPU1BROM_calculateCMAC at address 0x3f4000.

-Kedar

0 Kedar_Sirdeshpande 3 months ago in reply to Kedar_Sirdeshpande

TI__Expert 3370 points

Hi Marco,

Any update on this?

-Kedar

0 Marco Schlüter 3 months ago in reply to Kedar_Sirdeshpande

Prodigy 110 points

Hi Kedar,

I linked the programm again with the new libs you attached prior and that did the trick. Finally it works as espected. Thank you very much for your help with this. I will close the issue as resolved.

Marco

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28P550SG: Problem with CMAC and CPU1BROM_calculateCMAC in custom Bootloader