gnemas@gmail.com writes:
I built u-boot for a 440EPx board derived from the sequoia configuration.
I am using an FPU-enabled gcc cross compiler.
U-Boot runs fine and successfully boots my operating system (Linux and uClibc-based root filesystem).
However, I was having a problem running busybox that I traced to errors occurring executing setjmp, which attempts to save floating point registers.
Then I realized that the FPU was not enabled in the MSR or in the ccr0 register.
Have I misconfigured something, or should I go ahead and add code to u-boot to enable the FPU?
It is generally the responsibility of the kernel to enable the FPU for tasks which require it, allowing lazy save/restore of the FPU state on context switching. Enabling the FPU in u-boot might interfere with this.