update

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3044 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 20 insertions, 5 deletions

diff --git a/nuttx/configs/avr32dev1/README.txt b/nuttx/configs/avr32dev1/README.txt
index 06aed5bdb..eceafbf5a 100755
--- a/nuttx/configs/avr32dev1/README.txt
+++ b/nuttx/configs/avr32dev1/README.txt
@@ -112,20 +112,35 @@ IDEs
 AVR32 Bootloader

 ^^^^^^^^^^^^^^^^

 

+  Boot Sequence

+  -------------

+  

+    "An AVR UC3 part having the bootloader programmed resets as any other

+     part at 80000000h. Bootloader execution begins here. The bootloader

+     first performs the boot process to know whether it should start the

+     USB DFU ISP or the application. If the tested conditions indicate

+     that the USB DFU ISP should be started, then execution continues in

+     the bootloader area, i.e. between 80000000h and 80002000h, else

+     the bootloader launches the application at 80002000h."

+  

   Link Address

   ------------

 

-  The linker scripts (ld.script) assume that you are using the bootloader.

-  The bootloader resides at 0x8000:0000 and so the ld.script files link

-  the application to execute after the bootloader at 0x8000:2000. To link

-  so that NuttX boots directly without using the bootloader, change the

-  flash definition from:

+  The linker scripts (ld.script) assume that you are using the DFU

+  bootloader.  The bootloader resides at 0x8000:0000 and so the ld.script

+  files link the application to execute after the bootloader at

+  0x8000:2000. To link so that NuttX boots directly without using the

+  bootloader, change the flash definition from:

 

     flash (rxai!w)  : ORIGIN = 0x80002000, LENGTH = 256K - 8K

 

   to:

     flash (rxai!w)  : ORIGIN = 0x80000000, LENGTH = 256K

 

+  Or to use the MSC bootloader:

+

+    flash (rxai!w)  : ORIGIN = 0x80008000, LENGTH = 256K - 32K

+

   Entering the ISP

   ----------------