Since this hook is done with BL at this patch, it is necessary to put the patch in the range that can be fired by BL.
The default free space is #define Free_Space 0x1C1EC0.
Therefore, I think that it will work if it is set by the default setting.
If there is something else in the default space, you will have to change it.
However, this is not a problem of FEBuilderGBA, so I can not do anything.
In FEBuilderGBA, even when you insert a check mark in the checkbox for definition of free area when inserting EA, you just insert ORG at the beginning of the script.
ORG 0x01000000 //<<this
It does not define "#define FreeArea" etc.
In the very old version, there was also a time when I was defining, but now I have not done it anymore.
The reasons are that the way of writing changes slightly,
such as "FreeArea" or "Free_Area" or "FreeSpace" or "Free_Space".
And there are lots of code that does not specify multiple define checks.
Then it becomes multiple definition definition and fails to insert the script.
Therefore, I do only the ORG specification which is the least harmful.
If the ORG specification is written in the script, that will take precedence.