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I'd expect that to be right for firmware_start and rom1_addr.  I don't know the ram size for 1500D.  model_list.c has 256MB for 1300D, so I'd guess 1500D is either the same, or maybe 512MB since it's a later camera.

If you want, try:
.ram_size               = 0x10000000

and see if it makes your camera explode.  That's 256MB.  Try 0x20000000 for 512MB.  I don't know what the risk is if you get the ram size wrong.  Maybe the correct size is listed in some other thread.

Did this actually worked? I am looking forward for a fix. My dump gives exact same results. Thank you.