From mboxrd@z Thu Jan 1 00:00:00 1970 From: clark@esteem.com Message-Id: <1.5.4.32.20000819004501.006984e4@pop.esteem.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Fri, 18 Aug 2000 17:45:01 -0700 To: linuxppc-embedded@lists.linuxppc.org Subject: PPCBoot memory mapping problems Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Okay here is the situation, I have hacked & slashed the PPCBoot code to work with our custom board (all except the flash portion). I have mapped the memory as show below. address size name BR#/OR# buswidth 0x00000000 8meg Bank0 1 32 0x00800000 8meg Bank1 2 32 0x40000000 2meg Flash0 0 16 0x60000000* 2meg Flash1 3 16 0xFFF00000 whatever IMMR N/A N/A (* Note will be remapped to the end of flash0 to form contigious flash block when I get around to hacking the flash code) I have taken the "include/asm/mbx.h" and replaced its boardinfo structure with the one I used in the PPCBoot code and then compiled the kernel. Following the instructions in the readme file, I grabbed arch/ppc/coffboot/vmlinux.gz and converted as shown. It is given a load address of 0x00000000 and an entry point 0x0000000C. I put the converted image into flash using our ICE at address 0x40020000. Our board boots up checks the kernels CRC then uncompresses it. It then jumps to 0x0000000C. A little bit later it then jumps to some address 0xC000???? and faults. Is this what it is supposed to do? Am I supossed to have the RAM mapped at 0xC0000000? If it loads at address 0 how do I remap it to 0xC0000000 once the kernel starts? Is there any way to force the kernel to run in lower memory? Thanks in advance for any help. Conn Clark ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/