From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Date: Sat, 04 Aug 2012 16:58:00 -0500 Subject: [U-Boot] Testing report for i.MX51 using Linaro/Ubuntu gcc 4.6.3 (from Precise repositories), libgcc, etc. In-Reply-To: References: Message-ID: <501D9AE8.2030904@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 08/02/2012 12:49 PM, Matt Sealey wrote: > Marek Vasut insists I report this to the list, so here goes; > > Compiling a U-Boot for i.MX51 here (for the Efika MX) basically > doesn't operate well. Among other things, we got data aborts in > several places, most annoyingly sometime after boot_relocate_fdt. This > was using a 64-bit Ubuntu Precise Pangolin (12.04) installation, the > standard "arm-linux-gnueabi-gcc-4.6" (4.6.3-1ubuntu5) compiler and > other toolchain components (no modifications made). > > Using USE_PRIVATE_LIBGCC=yes solved the issues, as did changing to the > gcc 4.4.7 (4.4.7-1ubuntu2) and using either private libgcc or the one > provided by the toolchain. > > This is not the first problem we've ever had with the Linaro gcc > toolchain, especially not with 4.6. So far, reverting to building > using gcc 4.4.7 has solved all the problems, and we're using > USE_PRIVATE_LIBGCC by default now anyway because I don't see the point > in using the one provided with the toolchain if it is such a huge > unknown and U-Boot provides a compatible feature anyway. > > I'm not sure what anyone on the list is going to make of this or if it > influences some design decisions anywhere else in U-Boot, just that I > was nagged incessantly to "report my findings" - we all knew the > Linaro compiler generally sucks already, though, right? Do you have unaligned-accesses disabled? This version of the compiler and gcc 4.7 or later will generate unaligned accesses which u-boot does not enable the h/w for. There was a patch recently to address this. Rob