Hi All,
Finally I can almost understand what Grub is trying to do. Good job
making Grub less opaque :) :). Thanks to all.
I normally run with an SD card plugged into a USB2 adapter. Neat. I
can change OSs in a blink and easily keep my user files on a plug in
hard drive :). Nice.
When I installed Debian 9.4. It just worked. 9.4 had some other
problems though.
I have spent quite a bit of time trying to upgrade to Debian 9.5.
While Debian 9.5 allows me to try to install to an SD card, grub will
apparently NOT do the necessary work!!
Right now I can boot Debian 9.5 on SD only by using the grub
recovery memory stick to start it. The recovery memory stick DOES find
both the SD OS and the 'main' hard drive and allows me to start
either.
So far I have not been able to figure out how to tell grub-install
to put in the correct start address, etc. Grub-install fails with some
obscure message saying basically I will not do what you want. This is
apparently a new 'feature'.
I even tried copying the first 512 bytes to the new SD to see if
that would 'solve' my problem.
Now, I can see the low level grub boot jumping to some wrong
address and giving screen patterns, but no boot.
Suggestions please on the necessary magic sauce to get grub to do
whatever deed it needs to do.
Thanks in advance for your time and help.
Lots of fun :).
John
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