WKUP R5F:1, How can I change the DDR priority. 2, How to assign TCM

Hello,

boot code ,startup code has to be in TCM memory this will occupy very much less space. You can use remaining TCMA and TCMB free space by creating a new section in AUTOSAR Linker file.

You can also use internal Memories (OCRAM etc..) apart from DDR to have quick access.

Regards

Tarun Mukesh

Hi Tarun,

boot code ,startup code has to be in TCM memory this will occupy very much less space. You can use remaining TCMA and TCMB free space by creating a new section in AUTOSAR Linker file.

Yes,I tried to release one of the TCM.

Change the WKUP AUTOSAR Linker file,WKUP R5F cannot be run after the SBL is started，Watch the screenshot of the changes above.

You can also use internal Memories (OCRAM etc..) apart from DDR to have quick access.

Yes, I do use OCRAM, OCRAM space is too small. SBL More than half used

Hello,

jianwei lei said:

Change the WKUP AUTOSAR Linker file,WKUP R5F cannot be run after the SBL is started，Watch the screenshot of the changes above.

You can use MCU R5F to run AUTOSAR whereas SBL can run on the DM core which is WKUP R5F core.

Regards

Tarun Mukesh

Hi Tarun,

Thank for your quick reply!  

You can use MCU R5F to run AUTOSAR whereas SBL can run on the DM core which is WKUP R5F core.

Yes, that's what we did.

Our MCU R5F and DM WKUP R5F both run AUTOSAR, and SBL also runs in DM core.

Here's the process I understand: Power on the SBL to start running and load each core,When reloading DM core,Reset to boot entry(_self_reset_start),Start and initialize assembly code,Finally run to the DM(WKUP R5F) Main function.

MCU R5F uses MSRAM, DM WKUP R5F can only use part of OCRAM.

So we need to have A part of the TCM(A or B) out

(Here's my puzzle：I can only keep the Settings consistent with the MCU Plus Example,Cannot respecify boot code to run only on TCMB：.startupCode   : align = 8,        > R5F_TCMB)

or Increase the priority of WKUP R5F to access DDR

Hi jianwei lei,

jianwei lei said:

So we need to have A part of the TCM(A or B) out

But this part will be very small, isn't it? The only part, which is used by SBL, will need to be kept out. Rest entire TCM A and B memories can be used for your Autosar Task, isn't it? Is it not sufficient? 

Regards,

Brijesh

Hi Brijesh Jadav

Thank for your reply!  

At present, SRAM(OCSRAM+MCU_MSRAM) is sufficient and TCM is not needed.

But I still have my doubts，How do I use TCM correctly in link file (A or B) and make sure DM SBL resets correctly and loads DM WKUP to boot.

Hello,

If i understand correctly, you are asking

How does SBL load the WKUP DM R5F core to boot from respective TCM either TCM A or TCM B ? 

May i know which boot media are you using for SBL, based on the boot media for example SD card then It is run from an SD card . you can build this example like you do for the others using makefile .

• Partition the SD card to have boot and root parititon
• Copy sbl_sd.release.hs_fs.tiimage as tiboot3.bin to the boot partition of SD card
• Copy application image as app to the boot partition of SD card
• Depending on the type of SBL loaded, SBL looks for the multicore appimage of the application binary at a specified location in a boot media.
• If the appimage is found, the multicore appimage is parsed into multiple RPRCs. These are optimized binaries which are then loaded into individual CPUs.
• Each RPRC image will have information regarding the core on which it is to be loaded, entry points and multiple sections of that application binary
• The SBL uses this information to initialize each core which has a valid RPRC. It then loads the RPRC according to the sections specified, sets the entry points and releases the core from reset. Now the core will start running.
• So if you need to use particular TCM ( A or B) then set the entry point in the linker file of the application to the respective TCM memory section.

I hope you understand the explanation. 

Regards

Tarun Mukesh