Differences

This shows you the differences between two versions of the page.

--- en:xu3_bootloader [2015/02/02 16:32]
charles.park [Boot Media]
+++ en:xu3_bootloader [2015/02/02 16:32] (current)
charles.park [Boot Media]
@@ Line 1: / Line 1: @@
+====== Boot Loader======
+----
+===== Boot Media =====
+On ODROID-XU3 is a DIP Switch (sw1) to select the [[en:xu3_bootmode_configuration|booting Device]] and CCI Disable/Enable.
+^ SW1-1(Left of Dip Switch) ^ 1st Boot media ^
+|OFF|MicroSD card|
+|ON|eMMC|
+^ SW1-2(Right of Dip Switch) ^ CCI ^
+|OFF|Disable|
+|ON|Enable|
+**SW1-2 MUST be ON(CCI Enable) in order to boot properly.**
+===== Boot Sequence =====
+ Upon power on the board will search for the boot media. It will perform the following:
+  * 1) iROM (Code inside the SoC) will attempt to read the boot media at the first 512 bytes of it. On those first 512 bytes fwbl1 should exist.
+  * 2) fwbl1 will load bl2 (SPL) that is part of the U-boot.
+  * 3) bl2 will load U-boot.
+  * 4) U-Boot will do whats left, such as handle TrustZone, load kernel image if setted.
+=== fwbl1 ===
+ This blob is the first thing that CPU will call, we don't have much information on it since its provided by Samsung.\\ Position on SD: 1
+=== bl2 ===
+ This is the SPL, part of the U-Boot, upon building U-Boot you'll have the mkspl program what will extract it from the u-boot.bin\\ Position on SD: 31
+=== u-boot.bin ===
+ This is the U-Boot itself built. For more information about U-Boot please check their website:
+http://www.denx.de/wiki/U-Boot\\ Position on SD: 63
+=== TrustZone Software ===
+ This is the blob done by Samsung/ARM to support Trustzone platform.\\ Position on SD: 719
+=== Default Env ===
+ The default env provided in U-Boot will attempt the following:
+  * 1) Load boot.ini script from the first FAT type partition from the boot media.
+  * 2) Load kernel from its on media/ramdisk position (This is the Android Boot)