rolo: simplify parsing scramble header in load_firmware()

The standard load_firmware() function is used on targets which
use the "scramble -add" method for generating Rockbox binaries.

While it tries to be a bit more generic and allows the CRC/data
offsets to be placed anywhere in the file, there are no targets
which actually need this flexibility, because they are all using
plain old "scramble -add".

So we can actually simplify load_firmware() and remove defines
from the target headers. All the targets used CRC offset = 0 and
data offset = 8, except for a few which I assume never supported
ROLO or were never tested -- eg. samsungyh820: the CRC and data
offsets cannot both be 0.

The actual motivation for this is removing the calls to lseek(),
which can help make bootloaders a tiny bit smaller, as lseek is
typically not used anywhere else in bootloaders.

Change-Id: Ic2d01e5b75a32e88363f085e3e839146a0710bf4

1 files changed, 0 insertions, 2 deletions

diff --git a/firmware/export/config/sansaclip.h b/firmware/export/config/sansaclip.h
index faab50590c..9a17cec736 100644
--- a/firmware/export/config/sansaclip.h
+++ b/firmware/export/config/sansaclip.h
@@ -5,8 +5,6 @@
 /* For Rolo and boot loader */
 #define MODEL_NUMBER 40
 #define MODEL_NAME   "Sandisk Sansa Clip"
-#define FIRMWARE_OFFSET_FILE_DATA 8
-#define FIRMWARE_OFFSET_FILE_CRC 0
 
 #define HW_SAMPR_CAPS       SAMPR_CAP_ALL_96