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Replace the 4GB lpddr4  the uboot boot fail on imx8mq

Question asked by feng chen on Mar 31, 2020
Latest reply on Apr 1, 2020 by feng chen
 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