You could start by posting your file.
This is the file I'm practicing on together with a2l. Of course, my bin file for my car is different but I was told it's easier to learn with bin file that has a2l so I'm starting with that.
I try loading it 2 different ways but BOTH always giving me long hex and not loading the sub routines on the left.
One is follow the guide with 0x40000 ROM, other way is:
Step 1 : Open ida and press work on your own
setp 2 : Select binary
step 3 : click select powerpc(ppc) big-endian
step 4 : Set button
Step 5 : Click processor options
step 6 : Click and enter toc & Sda Address
Toc address : 0x5c9ff0
Sda address : 0x7ffff0
step 7 : Click ok
Step 8 : On memory organization
Ram : 0x600000 Size : 0x300000
Rom : 0x000000 Size : 0x200000
Loading address : 0x000000 size : 0x200000
Step 9 : Choose ppc on device name
Step 10: On loaded info type, leave everything checked and click ok
Step 11: Click on "both VLE and 32-bit"
Step 12: Click on file -> Load file -> load additional binary
Step 13: Insert Load segment : 0x0
Loading offset : 0x5c0000
File offset in bytes : 0x1c0000
Number of bytes : 0x40000
step 14: Click ok & Done
Step 15: Select from ROM: 0x00 to RAM:0x6000. Press C and analyze.