[wip] debug framebuffer init woes

src/platform/mailbox.rs

@@ -241,7 +241,8 @@ fn read(regs: &RegisterBlock, expected: u32, channel: u32) -> Result<()> {
             // is it a valid successful response?
             return Ok(());
         } else {
-            return Err(MboxError::ResponseError); //@fixme ignore invalid responses and loop again?
+            // will return on Timeout if no response received...
+            // return Err(MboxError::ResponseError); //@fixme ignore invalid responses and loop again?
         }
     }
 }
@@ -310,6 +311,7 @@ impl Mailbox {
             }
             _ => {
                 println!("\n######\nMailbox::returning UnknownError");
+                println!("{:x}\n######", self.buffer[1]);
                 Err(MboxError::UnknownError)
             }
         }

src/platform/vc.rs

@@ -1,4 +1,5 @@
 use crate::{
+    jtag_dbg_wait,
     platform::{
         display::{Display, PixelOrder, Size2d, CHARSIZE_X, CHARSIZE_Y},
         mailbox::{self, channel, response::VAL_LEN_FLAG, tag, Mailbox},
@@ -39,13 +40,15 @@ impl VC {
         mbox.buffer[16] = tag::AllocateBuffer as u32;
         mbox.buffer[17] = 8; // Buffer size   // val buf size
         mbox.buffer[18] = 4; // Request size  // val size
-        mbox.buffer[19] = 4096; // Alignment = 4096 -- fb_ptr will be here
+        mbox.buffer[19] = 16; // Alignment = 16 -- fb_ptr will be here
         mbox.buffer[20] = 0; // Space for response -- fb_size will be here
 
         mbox.buffer[21] = tag::End as u32;
 
         mbox.call(channel::PropertyTagsArmToVc).map_err(|_| ());
 
+        jtag_dbg_wait();
+
         if (mbox.buffer[18] & VAL_LEN_FLAG) == 0 {
             return None;
         }