I assume the subject is m8xx_cpm_dpalloc, not m8xx_cpm_hostalloc. > I am currently working with a MPC860 (Linux kernel 2.2.13) > and I need more DPRAM space for my BD/buffers, than the > space between IMMR+0x2800 - IMMR+0x2F00 (1792 bytes).
You can place your buffers outside the DPRAM (you can use m8xx_cpm_hostalloc for that). > I know the 860 has 5K of DPRAM : 4K + 1K of parameter RAM. > > So, I have tried to modify the value of > CPM_DATAONLY_BASE from 0x0800 to 0x0000 > CPM_DATAONLY_SIZE from 0x0700 to 0x1000 These values were chosen in regard to possibly active microcode relocation patches that could reside in the DPRAM. Does your boot code / monitor program / linux kernel load and use microcode relocation patches ? If so, you should determine the area where they reside so that you know which space is left for you in DPRAM. > but my kernel (compiled with those values) stucks early at boot time : > > ... > Uncompressing Linux... done. > Now booting the kernel > -(and no more)- Looks like your linux console doesn't work. Which SCC/SMC are you using as console ? Ciao - Tobias ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
