Some Linux options

Some Linux options-general Linux technology-Linux programming and kernel information. The following is a detailed description. To use the EABI feature in the Linux kernel (I don't know much about it, but I know it is helpful for floating point operations) to improve system performance and recompile the kernel. However, we get an invalid option abi = aapcs error. google it to find out that the gcc version is incorrect. This feature is not supported in 3.4.6.

I had to re-build the tool chain. After several gcc compilations, I re-compiled the kernel. OK, the compilation was successful, and downloaded to the board for running. No shell is available, this is another problem-floating point emulation is not selected. Make menuconfig: I did not select the option list at all. This is a big problem. I thought it was a compiler problem. I had to wait for half a day, but I still couldn't do it. I 'd better force a manual change. config File (in any document, I am prompted not to manually modify this file. I am also a dead horse). When I make menuconfig again, since the floating point emulation option appeared again, it was successfully completed.

But I still haven't figured out what to ask? I joined:

ONFIG_FPE_NWFPE = y
CONFIG_FPE_NWFPE_XP = y

These two rows. However, if I only add ONFIG_FPE_NWFPE = y, an error is prompted, and the default value is used. Keep the problem for now. Please check it out if you have time.