[U-Boot] Uboot bringing an RTOS instead of linux.

[rahanesh at tataelxsi.co.in]

Hi All,

I am currently working on OMAP3530 fromMistral solutions. This is the
booting sequence in OMAP3530

The OMAP3530 contains a boot ROM starting at location 0x00000000.  When
power on, the PC register jumps there.  The boot ROM then looks at the
sys_boot pins to determine boot order.  For NAND booting,

 the x-loader is located at offset 0 in NAND.  Actually the first two words
in NAND are the length of the x-loader and the address in internal RAM to
load it.  The boot ROM then reads the x-loader from NAND into 

internal RAM and jumps to that.  The x-loader configures the clocks and
SDRAM and then reads u-boot from NAND into SDRAM.  After u-boot is in SDRAM,
the x-loader jumps to u-boot and u-boot starts to run. If 

I don't press any key for 4 seconds uboot brings linux and linux shell comes
up. 

Instead of linux I need to bring my custom RTOS. As linux, custom RTOS will
reside in NAND Flash too.

What is the procedure for bringing an OS from uboot.? As uboot bringing
Linux , it needs to bring an RTOS too. 

How do I write a script for that? How do I tell uboot to load My custom rtos
instead of linux. I need to avoid the loading of linux and bring in my RTOS
.

Any help on this is highly appreciated

 

Thanks

Rahanesh


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