Dňa 2017-06-02 13:50 Ján Sučan napísal(a): > 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
Hello sephe, the solution I would implement is modification of the sys/tools/fw_stub.awk script so it will optionally take bin-endian version of firmware image and the module code generated will then contain conditionally compiled sections according to endianness. Image specification will be in format <firmware:name:version:big_endian_firmware> so it will be fully backward compatible. It will solve both cases: when firmware is compiled into the kernel and when it is embedded in a module. Thanks jan
