MidasBootloaderIncompatibleWithLinux¶

Introduction¶

The bootloader of the following devices is incompatible with upstream Linux:

Galaxy SIII (GT-I9300)
Galaxy SIII 4G (GT-I9305)
Galaxy Note II (GT-N7100)
Galaxy Note II 4G (GT-N7105)

When jumping to Linux, the booloader still has:

the instruction cache on
the data cache on
the MMU on

Documentation/arm/booting.rst which is there since 2003 states that:

"The MMU must be off."
"Data cache must be off."

Supporting s-boot¶

To workaround that:

However as the kernel evolved we need to patch it more and more:

The patch disabling the caches "was not necessary on Linux 3.4":lkml.iu.edu/hypermail/linux/kernel/1212.1/02099.html
Disabling CONFIG_GCC_PLUGINS was also not necessary on older kernel where the option was not even present