LPDDR4 problem on customized board

harry_choi — Thu, 13 Jan 2022 06:22:13 GMT

Hello Community,

I'm trying to bring up my custom board which Samsung LPDDR4 1G and S32G274A embedded.

But I don't know why DDR test is only passed with 800MHz and failed with other clocks(upper 800MHz).

I have several problem like below and I need someone's help.

1) Is the DDR tool in S32DS trustable 100%?

2) When I set the clock 800MHz or 1600MHz, and run read/write test(Operational test) on the tool but the measured clock was just 50MHz. What's the problem?

3) When I generate the C source code after run phy init test on the DDR tool and I add ddr_init(), initialization code, ddr_init() was passed but I cannot read DDR memory with below code and HardFault Exception happened.

/* Disable XRDC */

XRDC_REG_RMW32(XRDC_CR_0_ADDR32, XRDC_CR_GLVD_MASK, XRDC_CR_GLVD_DISABLE);
{
uint32_t value = *(uint32_t *)0x80000000;
printf("value=0x%x\n", value);
}

Does anybody know how to read/write on DDR in the M-core?

4) So, I tried to access DDR on u-boot and I can read/write DDR using reference source code on reference board(S32G-VNP-RDB2). But after I copy the DDR codes which were generated by DDR tool to u-boot source tree and build u-boot, then ddr_init was failed.

How can I update DDR source code in u-boot?

If someone succeeded to access DDR on their customized board, then let me know how to do.

Thanks,

Harry

topic LPDDR4 problem on customized board in S32G

LPDDR4 problem on customized board