Hello,
What sector does TIOS use for the swap sector in each model?
Thanks! Please keep in mind I cannot use privileged pages, as these are used for accessing privileged ports
SirCmpwn wrote:
Hello,
What sector does TIOS use for the swap sector in each model?
Thanks! Please keep in mind I cannot use privileged pages, as these are used for accessing privileged ports
Thank you! Do you know if those pages would be of use for KnightOS as well? I think I just want to use the last sector that doesn't include privileged pages.
You must not assume that is true. The swap sector can be any sector in the archive except the last. It will be the sector that starts with the byte 0FEh. Running the Boot code's self-test will erase all sectors, including the swap, making it so no sector is marked as being a swap sector. You must test for this condition, or your garbage collect code might be unhappy.
The self test erases user archive? It's only ever erased RAM for me O_o
No, the boot code has a separate self test from the OS's self test.
I'll look into a way of handling that, and study it a bit more.
It doesn't really matter which sector the TI-OS uses. You're making your own OS here, so you can do whatever you want
calc84maniac wrote:
It doesn't really matter which sector the TI-OS uses. You're making your own OS here, so you can do whatever you want
Yeah, I'm just trying to decide which sector I should use.
SirCmpwn wrote:
Yeah, I'm just trying to decide which sector I should use.
What factors are you taking into consideration when choosing the sector?
Two, mostly. First of all, the swap sector should be as far into the back of ROM as possible, because it will be more efficient to move the filesystem page by page instead of skipping the swap sector in the middle. Also, I don't want to use any privileged pages, because I need those to unlock flash in the first place
That makes sense. So the last sector is privileged (1F/3F/7F), right? Would the second-to-last sector be the right choice, then? Or did I overlook something?
I can't quite recall which pages/sectors are privileged, but I use 1C to unlock flash in KOS. I have a feeling that the second to last sector would be a good choice.
SirCmpwn wrote:
I can't quite recall which pages/sectors are privileged, but I use 1C to unlock flash in KOS. I have a feeling that the second to last sector would be a good choice.
Fair enough. I know BrandonW is around this morning; I wonder if he has any thoughts on the matter.
Excluding the boot code page(s) and the certificate page (which may or may not be privileged), there are two privileged pages: $1C/$3C/$7C and $1D/$3D/$7D.
Before these two pages (which make up one sector) would be the last 64KiB sector, which is $18/$38/$78-$1B/$3B/$7B.
Note that, on the 84+(SE), $2C/$6C-$2F/$6F is also ROM and cannot be modified.
If I understood you properly, you are suggesting $18/$38/$78-$1B/$3B/$7B, correct?
Yes
That and warning him about another boot sector on the 84+(SE)
calcdude84se wrote:
Yes
That and warning him about another boot sector on the 84+(SE)
