请问一下如何在uboot中固定ddr频率呢

KualaShaker

以下是我的core3399j打印信息，跟另一块firefly3399的ddr信息不同，想问一下如何让ddr上电就是800的频率
DDR Version 1.24 20191016
In
channel 0
CS = 0
MR0=0x98
MR4=0x2
MR5=0xFF
MR8=0x8
MR12=0x72
MR14=0x72
MR18=0x0
MR19=0x0
MR24=0x8
MR25=0x0
CS = 1
MR0=0x18
MR4=0x2
MR5=0xFF
MR8=0x8
MR12=0x72
MR14=0x72
MR18=0x0
MR19=0x0
MR24=0x8
MR25=0x0
channel 1
CS = 0
MR0=0x98
MR4=0x2
MR5=0xFF
MR8=0x8
MR12=0x72
MR14=0x72
MR18=0x0
MR19=0x0
MR24=0x8
MR25=0x0
CS = 1
MR0=0x18
MR4=0x2
MR5=0xFF
MR8=0x8
MR12=0x72
MR14=0x72
MR18=0x0
MR19=0x0
MR24=0x8
MR25=0x0
channel 0 training pass!
channel 1 training pass!
change freq to 416MHz 0,1
Channel 0: LPDDR4,416MHz
Bus Width=32 Col=10 Bank=8 Row=15/15 CS=2 Die Bus-Width=16 Size=2048MB
Channel 1: LPDDR4,416MHz
Bus Width=32 Col=10 Bank=8 Row=15/15 CS=2 Die Bus-Width=16 Size=2048MB
256B stride
channel 0
CS = 0
MR0=0x98
MR4=0x2
MR5=0xFF
MR8=0x8
MR12=0x72
MR14=0x72
MR18=0x0
MR19=0x0
MR24=0x8
MR25=0x0
CS = 1
MR0=0x18
MR4=0x2
MR5=0xFF
MR8=0x8
MR12=0x72
MR14=0x72
MR18=0x0
MR19=0x0
MR24=0x8
MR25=0x0
channel 1
CS = 0
MR0=0x98
MR4=0x2
MR5=0xFF
MR8=0x8
MR12=0x72
MR14=0x72
MR18=0x0
MR19=0x0
MR24=0x8
MR25=0x0
CS = 1
MR0=0x18
MR4=0x2
MR5=0xFF
MR8=0x8
MR12=0x72
MR14=0x72
MR18=0x0
MR19=0x0
MR24=0x8
MR25=0x0
channel 0 training pass!
channel 1 training pass!
channel 0, cs 0, advanced training done
channel 0, cs 1, advanced training done
channel 1, cs 0, advanced training done
channel 1, cs 1, advanced training done
change freq to 856MHz 1,0
ch 0 ddrconfig = 0x101, ddrsize = 0x2020
ch 1 ddrconfig = 0x101, ddrsize = 0x2020
pmugrf_os_reg[2] = 0x3AA1FAA1, stride = 0xD
ddr_set_rate to 328MHZ
ddr_set_rate to 666MHZ
ddr_set_rate to 416MHZ, ctl_index 0
ddr_set_rate to 856MHZ, ctl_index 1
support 416 856 328 666 MHz, current 856MHz
OUT