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Re: [microblaze-uclinux] Ruby on uclinux

Hi Wei,

Sounds ilke an interesting project - more comments below:

> Ruby is configured with ./configure, and I used CC=/path
> to/ucfront-gcc ,  target=mb and --with-static-linked-ext.  I have to
> modify config.sub to make it recognize mb-linux (just adding the
> names, and set default os of mb to be linux -- I am I right in doing
> this?)

The mods to config.sub sound fine.  I recommend, if Ruby supports it,
that you do a VPATH build.  Taking the example in ethtool:

uClinux-dist/user/ruby/Makefile:

all: build
        $(MAKE) -C build

build: Makefile
        rm -rf build
        mkdir build
        (cd build; CC="$(CC) $(CFLAGS)" LDFLAGS="$(LDFLAGS)"
LIBS="$(LDLIBS)" ..
/configure)

romfs:
        $(ROMFSINST) build/ruby /bin/ruby

clean:
        rm -rf build

This way, the build takes place out of the main source tree (in the
/build subdir), which means there's no manual Makefile hacking required.


> The build process can be completed and the resulting ruby executable is
> ruby: BFLT executable - version 4 ram
> 
> However, when I run it, I get
> Allocation of length 1099927 from process 77 failed

OK, so this is a memory allocation failure - the executable is clearly
quite large (approx 1MB?), and the kernel refused that memory allocation.

> Free pages:      249484kB (     0kB HighMem)
> Zone:DMA freepages:249484kB
> Zone:Normal freepages:     0kB
> Zone:HighMem freepages:     0kB
> ( Active: 278, inactive: 73, free: 62371 )
> 1*4kB 1*8kB 0*16kB 0*32kB 0*64kB 1*128kB 0*256kB 1*512kB 1*1024kB
> 121*2048kB = 249484kB)

This is strange, it seems that you have plenty of memory free, and
plenty of large (2MB) memory blocks available.

> Do you know what happened?  I think I encountered similar problems
> when I try to build a few other applications.  Here is part of my make
> file, and resulting parameters to ld.

In the kernel config -> general setup submenu, you might want to try
enabling the

[ ] Allow allocating large blocks (> 1MB) of memory

option.

Also (and seperately), maybe give this

[ ] Non power-of-2 kernel allocator (EXPERIMENTAL)

a try.

Regards,

John
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