Using non-menu CFE with working Radeon HD?

Hi

I just ordered myself an RX550 for my X1000. For this I need that CFE hack to get it to boot where it doesn't run the menu and the jumper to push output to serial.
Ref: https://www.amigans.net/modules/newbb/viewtopic.php?topic_id=8920

One question: Why can't I always use the non-menu boot option also for my old HD6750? That way only the jump would have to be changed if I need to swap cards.

Is that menu *required* for CFE to boot when the serial jumper is not set?
Ref:

I ask because I tried it, to be repared, but it doesn't seem to work (with my existing Radoen HD and the jumper not set). Says it can't find the boot disk or something, even if I use the same line as the menu does.

Thoughts on this?

@Deniil

I had a scary incident myself when testing the hack and switching cards.

I don't know but it seems the hd driver relies on something from the cfe menu being visible (coded in and tested during development) while the rx driver does not (since it was never meant to run on cfe [YET] and as such never had to be coded for cfe and ***maybe*** lacks that part of init/code in the rx driver [that the hd driver has])
This is pure speculation...

@Raziel

Yeah, I read about your incident! But that was the jumper, wasn't it?

But the problem with not using the menu with the HD card isn't that I don't get a picture in WB, it's that it can't find the harddisk to boot from for some reason. Can't remeber the exact error, but it just errored out saying it couldn't find the boot parition or something. Why?

So instead of loading the menu, it should just boot immediately from the configured disk, right? That's what it does with the RX card? So wouldn't the same command work with a HD card in the machine?

@Deniil

Ah, right, I missed that.

Does the error maybe involve something about running out of memory?

Because there is a known glitch in the cfe firmware where a flaky sata cable might not gr connected properly.

Why it works one way but not the other is beyond me though

Could you maybe post a serial log output?