We have a house built in the 1950s that has no overhang on the front (above the front door and window). This has led to water damage above the window from ice building up on the roof. We will be adding heating materials to the roof to avoid the ice problem, but I need to repair the wall damage inside. The wall has texture, which has been crumbling off, and the material underneath seems dry. How do I go about fixing this? I'm not concerned with adding texture back. I just want to fix the cracks, patch it up, and paint it. There isn't lath as far as I can see. In the past, I have used latex spackel to fix a much smaller issue on another window. This is much bigger.  

[![detail of wall](https://i.stack.imgur.com/vYxp6.jpg)](https://i.stack.imgur.com/vYxp6.jpg)

[![top corner crack](https://i.stack.imgur.com/NyZ6r.jpg)](https://i.stack.imgur.com/NyZ6r.jpg)