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, 9 deletions

diff --git a/firmware/export/config/vibe500.h b/firmware/export/config/vibe500.h
index edbc1e321a..b6d2e5082a 100644
--- a/firmware/export/config/vibe500.h
+++ b/firmware/export/config/vibe500.h
@@ -158,15 +158,6 @@
 /* We're able to shut off power to the HDD */
 #define HAVE_ATA_POWER_OFF
 
-/* Offset ( in the firmware file's header ) to the file length */
-#define FIRMWARE_OFFSET_FILE_LENGTH 0
-
-/* Offset ( in the firmware file's header ) to the file CRC */
-#define FIRMWARE_OFFSET_FILE_CRC 0
-
-/* Offset ( in the firmware file's header ) to the real data */
-#define FIRMWARE_OFFSET_FILE_DATA 8
-
 /* USB On-the-go */
 #define CONFIG_USBOTG USBOTG_ARC