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Optimize mx5 lowlevel_init.S code size: - Compute values at compile time rather than at runtime where possible. - Assign r4 to hold the zero value rather than setting registers to 0 again and again. - Associate a function to setup_pll rather than expanding its large macro code multiple times. - Allocate constant values in section only if used. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com> Cc: Stefano Babic <sbabic@denx.de> Tested-by: Stefano Babic <sbabic@denx.de> Acked-by: Stefano Babic <sbabic@denx.de>