Kernel Start-up Time

[Bahadir Balban]

Caglar Akyuz wrote:
> Hello,
> 
> While measuring Linux start-up time, I see that printing version string in 
> "start_kernel" takes ~1.3 seconds. I guess this is the time between from 
> "bootloader jumping to uImage" and "printing version string in generic 
> start_kernel code".

> Thanks,
> Caglar
> 
> _____________________________________________________________________ 
>                                                                                                                                                                   
> [    4.700896] Starting kernel ...                                                                                                                                                  
> [    4.702971]                                                                                                                                                                      
> [    5.966039] [    0.000000] Linux version 2.6.30-davinci1-06079-g4e73fae-

Hi Caglar,

This sounds like the kernel decompression is taking time. Have you tried
booting an uncompressed kernel? See if you can print on physical uart
address from files under arch/arm/boot/compressed

Thanks,

-- 
Bahadir