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POIs my bootloader doing enough to boot Linux Image
 

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  1. POIs my bootloader doing enough to boot Linux Image
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    <p>I am new to bootloader and Linux kernel. I have been working on a project where we have to replace booting QNX kernel with Linux kernel .Our current bootloader code has a support for booting QNX kernel.It seems like bootloader also has support for booting Linux(NOT sure) and I need to know is it doing enough to boot Linux Kernel.</p> <p>Below is what our Bootloader is doing.</p> <p>Bootloader is calling start_kernel function which have two argument passed to it one is kernel entry point and second is pointer to boot line </p> <p>1.Address 0X90000ULL which is type casted to boot_params structure.</p> <p>2.Relocate initrd </p> <p>3.Copy boot sector ,Set up data and commad line to final resting place</p> <p>4.Initialize Linux GDT</p> <p>5.Jump to Kernel entry point</p> <p>6.Disable interrupt </p> <p>7.Lunch_kernel()</p> <p>Now in above code two tricky things which doubted support for Linux kernel booting.</p> <p>The first thing is the way Jump to kernel entry point, normally I see jumping to kernel entry in uboot or Linux source is in assembly but in our bootloader it simply filing a structure .</p> <pre><code>struct { long Kery; long kernel_code_segment; } jumpv; void *jump_s; jumpv.kery=first argument pass to start_kernel; jumpv.kernel_code_segment=0x10; jump_s=(void *)&amp;jumpv; </code></pre> <p>Second thing is the Lunch_kernel() for which definition is not present at all in code base. </p> <p>Now is above stuff enough to pass control to Linux image or what else I can add/modified to boot the Linux image in our current bootloader code.</p> <p>We are on working X86 architecture.</p> <p>Due to some reason we can't do hit and trial on our board until we are sure about things.</p>
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    1. USAmit Singh Tomar
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    1. COTry the forums at osdev.net, the people there have vast experience with these things...
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      1. USstdcall
    2. COThanks @Mellowcandle for your suggestion.
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      1. USAmit Singh Tomar
 

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