i.MX ProcessorsのトピックRe: Replace the 4GB lpddr4 the uboot boot fail on imx8mq

Replace the 4GB lpddr4 the uboot boot fail on imx8mq

chenfeng2016 — Tue, 31 Mar 2020 08:24:03 GMT

Hello.

we change the lpddr4 3GB to 4GB, then update the firmware by uuu.exe, the update always fail, the log stop , after print the "DRAM :" the log as below:

we modify the code as follow:

1. change the PHYS_SDRAM_SIZE to 4G：#define PHYS_SDRAM_SIZE 0x100000000

2. get the lpddr4_timing.c file by MSCALE_DDR_Tool.exe tool and the MX8M_LPDDR4_RPA_v24.xlsx with new ddr chip params

we debug the uboot souce code, it boot fail when the size += gd->bd->bi_dram[i].size of the show_dram_config is executed

By the weay

if we change the PHYS_SDRAM_SIZE to 3G #define PHYS_SDRAM_SIZE 0xC0000000,

the uboot can run normally;

What's the reason?

Best Regars

feng

Re: Replace the 4GB lpddr4 the uboot boot fail on imx8mq

igorpadykov — Tue, 31 Mar 2020 10:17:57 GMT

Hi feng

issue may be related to TEE, one can disable it using sect.5.6.11 OP-TEE

attached Yocto Guide.

TEE can't be set in the top of the memory if 4GB are used, because above 4GB space,

only A53 can use it, So for i.MX8MQ one can split 4GB memory as 3GB + 1GB and keep

TZ address not changed. Also recommended to use release L4.14.98_2.1.0 and later, which
has 4 GB support implemented by default.

Best regards
igor
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Re: Replace the 4GB lpddr4 the uboot boot fail on imx8mq

chenfeng2016 — Tue, 31 Mar 2020 11:11:17 GMT

Hello, igor

we check the uboot .config ， the OPTEE is not set

we test on the 4.14.98-2.2.0 release , only change the PHYS_SDRAM_SIZE to 4G :#define PHYS_SDRAM_SIZE 0x100000000,

it is fail also , when update the firmware by uuu.exe.

Re: Replace the 4GB lpddr4 the uboot boot fail on imx8mq

chenfeng2016 — Wed, 01 Apr 2020 10:48:09 GMT

Hello, igor

There is another question need your help.

the params of the Number of ROW Addresses is 16 or 17, which is inputed ?

as the below 32G be used (32gb, R[16:0],c[9:0]),

Beset Regards

feng