Hint: on x86 it's essentially one billion instructions before you can
even think about using RAM, much less loading the payload.
This is why everybody using INTEL silicon do have FSP as A MUST (instead SEC+PEI). And this is why CORE CPU creations (2C+) have > 500 million gates per silicon. There gazillions of modes, which are probably only 10% used in real scenarios. All others are testing modes. And INTEL made smart investment forcing customers to pay for that (excessive silicon use/overkill).
which is to load linux from flash. It's working fine on UEFI today and
I'm seeing what it takes to replace the coreboot ramstage with linux.
YUP. Since no OS loader, only one/single OS instance to be actually loaded from flash. Then you don't care about AHCI, SATA, IDE and other HDD/SSD modes, also about GFX (embedded Linux) and also CSM or UEFI. No INT, no Run Time Services. You are running true ram disk, unpacked from flash as well.
Zoran
On Tue, Sep 5, 2017 at 1:45 AM, ron minnich rminnich@gmail.com wrote:
On Mon, Sep 4, 2017 at 3:41 PM Philipp Stanner stanner@posteo.de wrote:
Start the board, load the OS and go back into your flash until reboot.
Just checking, but have you looked at the code to see what "start the board" really means? Hint: on x86 it's essentially one billion instructions before you can even think about using RAM, much less loading the payload.
I'm guessing, by what you are saying, that you are not familiar with what has to be done. Apologies if I am wrong :-)
And, that said, I'm back to the old original idea, which is to load linux from flash. It's working fine on UEFI today and I'm seeing what it takes to replace the coreboot ramstage with linux.
ron
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