Boot up Sequence of imx6ul board without SPL

[surendradhobale]

Hello,

        I am developing the custom board, I have reference of the hobbit board ( pico-imx6ul). I am trying to understand the boot sequence from the RESET of the board.

Previosly my understanding was SPL load in internal RAM and uboot will load in DDR.

But I think currrently this is not case. Can you please explain me the bootup sequence in uboot ?

Thanks,

Surendra

[igorpadykov]

Hi Surendra

from processor point loading process is described in i.MX6UL Reference Manual

sect.8.7.1 Image Vector Table and Boot Data

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6ULRM.pdf

or for example Figure 1. Typical memory layout AN4581

http://www.nxp.com/assets/documents/data/en/application-notes/AN4581.pdf 

also there are some number of uboot environments which control load process,

these are described in uboot documentation

UBootEnvVariables < DULG < DENX 

arm - Understanding Linux load address for U-Boot process - Stack Overflow 

Best regards
igor
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