Dňa 2017-06-02 03:07 Sepherosa Ziehau napísal(a): > On Fri, Jun 2, 2017 at 4:58 AM, Ján Sučan <sucan...@fit.cvut.cz> wrote: >> Hello to all, >> >> I would like to ask for a help with an issue for which I am not sure >> about a clean solution. >> >> With isp driver firmware I wanted to do the same as I did with mxge: to >> move firmware data from arrays in C header files to uuencode .uu files >> in a sys/contrib/isp. >> The issue is that the firmware is stored in arrays of uint16_t. The isp >> driver has macros for handling the firmware data on both little-endian >> and big-endian machines. But it seems, that it uses some of those >> uint16_t values not caring about endianness (see the >> sys/dev/disk/isp/isp.c line 841 where the value is used directly for >> controlling number of repetitions of a while cycle). >> >> Currently, the correct order is ensured at compile-time. If the firmware >> is moved to files it will be saved with fixed endianness. So it wil be >> OK on little-endian and bad on big-endian or the other way around. >> I think of modifying firmware data right after firmware_get() so driver >> will find expected endianness. > > Maybe just generate two version of uu files (one big endian, one > little endian), and install the correct version of uu file (we only > support little endian currently). This may be simpler than other > ways. > > Thanks, > sephe
Hello sephe, thanks for the tip. It seems, that the make system does not provide endianness detection. I could add something like bsd.endian.mk in FreeBSD where endianness is defined statically according to selected target machine architecture. The endianness should be treated also in a case, when the firmware is to be compiled into the kernel (sys/conf/files). It could be done by additional level of preprocessing before <name>.fw target where it should be decided which .uu file to use. Or, because DragonFly BSD supports only little-endian architectures, the other solution could be to use ostrich algorithm and ignoring the issue. Thanks jan
