AM5708: SD mode boot

user4205571

Part Number: AM5708

Hi：

board：Custom board AM5708

RDK：ti-processor-sdk-linux-am57xx-evm-04.03.00.05-Linux-x86-Install.bin

My board can't be started using SD mode, the serial port does not print information,and the debugging situation using CCS is as follows

1、After connecting CCS, reset the CPU, as shown below

2、Set the CPSR value to 0x00

3、Load u-boot-spl.bin

4、Load u-boot-spl

5、Start single step debugging

First enter the reset () function


6、Here we find that the CPSR value changes to 0x0000001A is set to HYP mode
as shown below：


7、Next jump to the save_boot_params() function


8、Next jump to the save_boot_params_ret() function


9、Next jump to the switch_to_hypervisor() function


10、Next jump to the switch_to_hypervisor() function



11、When executing the above  push stack program, the following error occurs.




If the value of CPSR is set to 0x1A or 0x13 in the second step, the program will run normally.

View the u-boot code：arch/arm/cpu/armv7/start.S
arch/arm/mach-omap2/lowlevel_init.S

over 6 years ago

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

Hi,

SD card boot should be executed from an SD card. If you don't see anything printed on the debug console, the probable reason is that you have not bypassed the ID EEPROM check in SPL.

0 user4205571 over 6 years ago in reply to Biser Gatchev-XID

Expert 1390 points

HI：

Why does CCS execute "push{r4-r12, Lr}" error when the CPSR value is set to 0x00?

0 Kemal R. Shakir over 6 years ago in reply to user4205571

TI__Guru 55345 points

Hello user4205571,

On which reference design board is your custom board based?

Best regards,
Kemal

0 Kemal R. Shakir over 6 years ago in reply to Kemal R. Shakir

TI__Guru 55345 points

Hello user4205571,

Please, also refer to this thread. You must completely fill out the DDR spreadsheet, including accurate trace lengths of their CLK and DQS signals and correspondingly populate the PHY_CTRL registers that are generated by the tool. If you fail to do both of these, then sometimes the leveling fails to properly converge. You should be able to see this in the printouts from the DSS script:

A. Sometimes it will actually log a leveling timeout error.
B. The PHY_STATUS registers should normally be very close, i.e. within 1-2 counts. If there is a leveling issue you might see one of them drastically off.

Best regards,
Kemal

0 Kemal R. Shakir over 6 years ago in reply to Kemal R. Shakir

TI__Guru 55345 points

Hello user4205571,

Have you managed to solve this issue?

Best regards,
Kemal

0 user4205571 over 6 years ago in reply to Kemal R. Shakir

Expert 1390 points

Hi：
I have solved the problem。
we connected JATA to the reset pin of AM5708 and did the pull-down and reset all the time due to the circuit fault

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AM5708: SD mode boot