From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ulf Samuelsson Date: Thu, 12 Oct 2006 22:49:25 +0200 Subject: [U-Boot-Users] software FP yada yada yada References: <20061012203005.DB047353BDE@atlas.denx.de> Message-ID: <011f01c6ee45$0eefaba0$0d68fe51@atmel.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de > In message <131AF8573CF31945B5B11E4201D3F1E142BA28@mail3.Avidyne.com> you wrote: >> >> When I got 1.1.4, I get the infamous message about how u-boot needs a >> software FP whereas my gcc is set up for hardware fp. >> >> What I would LIKE to know is why 1.1.2 builds just fine but 1.1.4 does >> not. > > There have been so many changes between 1.1.2 and 1.1.4 that it's > difficult to tell which specific change causes the problem, but if > you check the "make" output you can clearly see where the problem is > coming from - your compiler fails to provide the required softfloat > routines. Which is kind of funny, since there are not so many ARM > systems with FPU around. > According to the crosstool documentation at www.kegel.com: Most combinations of gcc 3.x.x and binutils fails when you try to build a softfloat toolchain All tested combinations of gcc-4.x.x and binutils fails if softfloat is enabled. If you want to use gcc 4, you cannot build u-boot as is. > My recommendation is to fix the toolchain IIRC, An file included by the top makefile defines CFLAGS to include -msoftfloat. Removing -msoftfloat from CFLAGS allows you to build U-boot with your normal compiler. I did that, and u-boot 1.1.4 compiled fine after that. Personally, I think -msoftfloat should be optional. Before Wolfgang start complaining about bloat, I'd like to point out that due to segment boundaries in the AT45DB642D a total of 256 kB is av ailable for the dataflashboot, u.boot and u-boot environment and it is meaningless to save a byte here and there. It is worth 10s of kB to be able to use a single toolchain to build u-.boot, Linux and filesystem . > Best regards, > > Wolfgang Denk > > -- Best Regards Ulf Samuelsson