DTCM i.MXRT 1052 configuration

[davidrozenski]

Dear All,

I am using MIMXRT1050-EVK and would like to configure DTCM for 512 Kb at the first place of my software, I did the following : 

___writeMemory32(0x400AC040, 0x80000000); //IOMUXC_GPR_GPR16
___writeMemory32(0x400AC044, 0xAAAAAAAA);

but I get hardfault on the second line, any advise about this ?

I call these 2 lines just after clock init.

Regards

David

[jay_heng]

Best practice is to configure FlexRAM in Reset_Handler as below:

__iomux_gpr16_adr     EQU  0x400AC040
__iomux_gpr17_adr     EQU  0x400AC044

__flexram_bank_cfg    EQU  0xAAAAAAAA

Reset_Hanlder
    CPSID I                     ;关闭全局中断
    LDR R0,=__iomux_gpr17_adr
    MOV32 R1,__flexram_bank_cfg
    STR R1,[R0]
    LDR R0,=__iomux_gpr16_adr
    LDR R1,[R0]
    ORR R1,R1,#4
    STR R1,[R0]

[jay_heng]

Note that you need to configure IOMUXC_GPR_GPR17 before IOMUXC_GPR_GPR16, and why you configure IOMUXC_GPR_GPR16 as 0x80000000? it should be 0x00200007.

___writeMemory32(0x400AC044, 0xAAAAAAAA);//IOMUXC_GPR_GPR17

___writeMemory32(0x400AC040, 0x00200007); //IOMUXC_GPR_GPR16

[jay_heng]

As RT1050 only contains 512KB FlexRAM, not other dedicated OCRAM, so your application .data/.bss sections have to be resided in FlexRAM region.

In this case, you need to put FlexRAM configuration code before .data/.bss init process of your application, or there will be hardfault. because .data/.bss will be damaged after FlexRAM configuration.

[ofirvn]

do you have sample code or application node also for RT1166 and RT1172?

[igorpadykov]

Hi David

for configuration examples one can look at sect.2.1.1.2. Runtime

configuration AN12077 Using the i.MX RT FlexRAM
https://www.nxp.com/docs/en/application-note/AN12077.pdf

Best regards
igor
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