Struggling with boot from initialized onchip RAM

If you only have one block of RAM available, the default linker setup should be okay. You can press the "Restore Defaults" buttons in both the Linker Memory Regions and then the Linker Section Mappings area to get back to the defaults.

You don't need to get the .text section into the "reset" region. Instead you need both .entry and .text to be in the same memory device.

One common problem when trying to run from initialized RAM is not setting the hal.linker.allow_code_at_reset option in the advanced settings.