linux kernel - How MLO (minimal bootloader) works? -

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i trying understand how mlo loaded on-chip of soc , minimal configuration. using ti dm8168 soc.

i have gone through following link understand mlo or x-loader:

http://omappedia.org/wiki/bootloader_project

i got know rom code loads mlo (x-loader) on-chip ram of soc minimal configuration , loads uboot (universal bootloader), initiates linux kernel.

my doubt here on-chip ram size 64 kb , mlo size 116 kb, how rom code loading mlo on-chip ram

it seems dm8168 has more 64kib internal ram: explained in dm816x am389x psp 04.00.01.13 feature performance guide, has @ least 2 more blocks of internal ram, referenced omc0 , omc1, both being 256kib in size.

those 2 banks can used u-boot according document:

ocmc0 0x40300000 - 0x4033ffff ocmc 0 used rom code , u-boot. once linux kernel boots, ocmc0 free , kernel can use it. if ocmc0 should not used load u-boot if loaded using ccs.

ocmc1 0x40400000 - 0x4043ffff ocmc 1 used rom code , u-boot. once linux kernel boots, ocmc0 free , kernel can use it.

from u-boot-omap3/board/ti/ti8168/config.mk, seems u-boot using omc1

ti_load_addr = 0x40400000

this explain why 116kib u-boot image can fit in dm8168 internal ram.


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