cdba: Rely on fastboot completion rather than USB disconnect

The purpose for providing different exit codes (2 vs 110) for timeout
before or after fastboot was to allow tools invoking cdba to detect if
the device arrived at and performed fastboot or not.

In most cases relying on the fastboot (USB) disconnect notification
works fine, but in cases where the provided image fails to decompress
the standard fastboot implementation will OKAY the transfer, fail to
process the image and then return to process further fastboot requests.

This has been observed in cases where the image is too big, or when it
contains a big endian kernel.

Change the logic to rely on the "FASTBOOT_DOWNLOAD" response to
determine that we did reach fastboot and where able to upload the image
and then something happened - i.e. "there's a problem with the image" vs
"there's a setup problem".

Signed-off-by: Bjorn Andersson <[email protected]>

cdba.c

@@ -533,13 +533,11 @@ static int handle_message(struct circ_buf *buf)
 				} else {
 					quit = true;
 				}
-			} else {
-				fastboot_done = true;
-				// printf("======================================== MSG_FASTBOOT_PRESENT(off)\n");
 			}
 			break;
 		case MSG_FASTBOOT_DOWNLOAD:
 			// printf("======================================== MSG_FASTBOOT_DOWNLOAD\n");
+			fastboot_done = true;
 			break;
 		case MSG_FASTBOOT_BOOT:
 			// printf("======================================== MSG_FASTBOOT_BOOT\n");
@@ -556,6 +554,7 @@ static int handle_message(struct circ_buf *buf)
 			break;
 		case MSG_FASTBOOT_CONTINUE:
 			// printf("======================================== MSG_FASTBOOT_CONTINUE\n");
+			fastboot_done = true;
 			break;
 		default:
 			fprintf(stderr, "unk %d len %d\n", msg->type, msg->len);