[U-Boot] Issue with relocating code to DDR

[Heiko Schocher]

Hello SHEKHAR SINGH,

Am 01.11.2018 um 14:44 schrieb SHEKHAR SINGH:
> Hi All,
> 
> I am new to U-boot. Currently, I am working on developing U-boot for a new
> SOC. The SOC has arm926ej-s as the core and is implemented on Xilinx FPGA
> with SD-card as the boot device. With current setup DDR is already
> initialized by FPGA and SD card can be accessed using direct addressing. We
> have added board files and SoC related files to the Uboot directory and is
> able to successfully compile and get some outputs on UART (debug console).
> Currently, we have added only support for GPIO and UART drivers.
> 
> SD Card : 0x00000000 - 0x007FFFFF
> SRAM    : 0x90000000 - 0x90007FFF
> DDR       : 0x40000000 - 0x43FFFFFF
> 
> We are facing some issue with the uboot booting. We are able to see the
> initial uboot prints and debug prints when the stack pointer is in SRAM,
> but after we relocate the code from SD card to DDR and change the stack
> pointer to DDR we are getting junk prints on the console. Can anyone help
> me or suggest me what we are doing wrong here? Thanks in advance for your
> help.
> 
> Please see the below UART Log:
> 
> initcall: 00005cdc
> initcall: 00009a84
> initcall: 00005ccc
> initcall: 00005fbc
> initcall: 000060c0
> initcall: 00000418
> initcall: 00006090
> initcall: 00005fb4
> malloc_simple: size=18, ptr=18, limit=400: 90000b30
> malloc_simple: size=54, ptr=6c, limit=400: 90000b48
> malloc_simple: size=4, ptr=70, limit=400: 90000b9c
> uclass_find_device_by_seq: 0 -1
> uclass_find_device_by_seq: 0 0
>     - -1 -1 'root_driver'
>     - not found
> initcall: 00006088
> initcall: 000010b0
> initcall: 000004a8
> initcall: 0000f77c
> env_init: Environment nowhere init done (ret=0)
> initcall: 00005f88
> initcall: 0000f0dc
> initcall: 000147c0
> 
> 
>   U-Boot 2018.09 (Nov 01 2018 - 18:33:40 +0530)
> 
>   initcall: 00005eac
>   U-Boot code: 00000000 -> 00024604  BSS: -> 00030608
>   initcall: 00000438
>   CPU: SoC Version 0.01
>   CPU clock:        75MHz
>   SDRAM clock:      75MHz
>   initcall: 00006470
>   initcall: 00005f70
>   DRAM:  initcall: 000010ec
>   SDRAM Reg 000 : ffffffff
>   EDAC Reg  004 : ffffffff
>   SDRAM Reg 100 : ffffffff
>   EDAC Reg  104 : ffffffff
>   EMC Reg       : 1ff
>   initcall: 00006178
>   Monitor len: 00030608
>   Ram size: 04000000
>   gd->relocaddr : 44000000
>   Ram top: 44000000
>   initcall: 00005cfc
>   initcall: 00006098
>   initcall: 00005d14
>   initcall: 000060a0
>   initcall: 00005e44
>   Reserving 193k for U-Boot at: 43fcf000
>   initcall: 00005e18
>   Reserving 1152k for malloc() at: 43eaf000
>   initcall: 00005f1c
>   Reserving 80 Bytes for Board Info at: 43eaefb0
>   initcall: 000060a8
>   initcall: 00005de4
>   Reserving 200 Bytes for Global Data at: 43eaeee8
>   initcall: 00005d5c
>   initcall: 000060b0
>   initcall: 000060c8
>   initcall: 000061f4
>   gd->relocaddr : 43FCF000
>   initcall: 00005d1c
>   initcall: 000060dc
> 
>   RAM Configuration:
>   Bank #0: 40000000 64 MiB
> 
>   DRAM:  64 MiB
>   initcall: 00005d40
>   New Stack Pointer is: 43eaeec0
>   initcall: 00005ed8
>   initcall: 000060b8
>   initcall: 00005fd0
>   __image_copy_start : 00000000
>   __image_copy_end : 00024604
>   gd copied successfully to new gd...
>   Relocation Offset is: 43fcf000
>   Relocating to Addr 43fcf000, new gd at 43eaeee8, sp at 43eaeec0
>   Current Stack Pointer 90000a60

Cannot say very much... so just some speculations:

Stack pointer seems not to be in RAM

May your RAM does not work correctly?

bye,
Heiko

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