RBL, UBL , PSP Boot loader

Theo Debrouwere theo.debrouwere at barco.com
Thu Sep 11 10:00:25 CDT 2008

This document


documents the other ways of booting.
It is 6467 related, but the other davinci's use similar booting methods 



Gole, Anant wrote:
> Nitin,
> The terms are are as follows:
> 1. RBL - Rom bootloader - embedded in the chip
> 2. UBL - User boot loader - NOT in the chip - RBL boots UBL (except 
> for NOR and UART boot modes) which boots a secondary bootloader. There 
> are size constraints on what RBL can boot and since most secondary 
> bootloaders do not fit in the size UBL is required - provided by PSP
> 3. UBoot - secondary bootloader that PSP provides - typically used to 
> boot linux kernel.
> When someone says PSP Bootloader it could mean either UBL and UBoot 
> and both are NOT in the chip - they are on the external NOR/NAND memory.
> I assume you have seen the app note "Booting DaVinci EVM from NAND 
> Flash" which explains the procedure of using UBL/uBoot:
> http://focus.ti.com/lit/an/spraaa0/spraaa0.pdf
> Regards,
> Anant
> ------------------------------------------------------------------------
> *From:* davinci-linux-open-source-bounces at linux.davincidsp.com 
> [mailto:davinci-linux-open-source-bounces at linux.davincidsp.com] *On 
> Behalf Of *Nitin Mahajan
> *Sent:* Thursday, September 11, 2008 6:01 PM
> *To:* davinci-linux-open-source at linux.davincidsp.com
> *Subject:* RBL, UBL , PSP Boot loader
> Hello !
> Can some one please explain whether the "TI UBL" and "PSP Bootloader 
> are same"?
> IF PSP Bootloader is not the UBL then where does it reside?
> Whether the RBL and UBL already programmed in the DaVinci chip?
> regards
> -Nitin
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