Hi, On Wed, Dec 2, 2015 at 9:37 PM, dani <dgcb...@gmail.com> wrote: > In the HG556a router the partition mtd0, where CFE lives, is read only. > This patch allows this partition to be writeable. > > The BCM6358 SoC has two cores, but they are not identical. The second core has > half icache. > core0: icache=32kB > core1: icache=16kB > > As default the HG556a uses the second core as the main one (configured by > CFE). > Since currently there isn't SMP support for using both cores, we want to use > the > one with the best performance. > > For using the core0 as the main one, we need to write some bytes at the offset > 0x014 of mtd0 (CFE). Therefore we need the mtd0 partition to be writeable. > > After setting the core0 as the main one, the performance can increase up to > +20% (tested). The performance gain isn't marginal. > > For setting the core0 as the main one in an easy way I wrote a very simple > utility: > https://wiki.openwrt.org/_media/media/huawei/tp0set.tar.gz > It can switch from core0 to core1 or vice versa in OpenWrt writing proper > bytes > into bcm6358 CFE (fully tested in the HG556a, no bricks).
To be honest, I'm not very comfortable with making the CFE partition writable, and rather add code to lzma-loader that switches back to thread 0, then add lzma-loader for the affected devices. Jonas _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
