From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <392527F3.D5CB2F06@raleigh.ibm.com> Date: Fri, 19 May 2000 07:39:31 -0400 From: Ralph Blach MIME-Version: 1.0 To: Daniel Wu CC: linuxppc-embedded@lists.linuxppc.org Subject: Re: Porting LinuxPPC References: <00May19.143130est.115267@border.alcanet.com.au> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Daniel, Although I am not an expert, I really think the lowest kernel base is 0x80000000. This is because the Linux which we have assumes that we have memory from 0x0 - 0x7fffffff avaliable for tasks. So I think the kernel will have to move above 0x80000000. Chip Daniel Wu wrote: > > Hi, > > I have a question about the embedded ppc port of Linux which I hope you can > help me with. > > I compiled the mpc8xx-2.2.13 sources using the attached configuration for a > MPC860T based board with 32MB of RAM. The output vmlinux file was downloaded to > > the target using a BDM debugger. I changed the KERNELLOAD and KERNELBASE to > 1000000 instead of c0000000 so that the code is located at the start of the > 16MB region. > > When I step through the code (.../arch/ppc/kernel/head.S), I see that the code > is crashing after the rfi. The PC is 0x02000000 (32MB), which is greater than > the available RAM. But I checked the value of r0 and it looks reasonable, ie. > where the start_here is defined. > > *** Line 1753 *** > > lis r0,start_here@h > ori r0,r0,start_here@l > 1010: mtspr SRR0,r0 > SYNC > rfi /* enables MMU */ > > #ifdef CONFIG_SMP > .globl __secondary_start_psurge > __secondary_start_psurge: > li r24,1 /* cpu # */ > b __secondary_start > > etc. > > Do you have any suggestions to how to track down this problem? Is this > introduced by the fact that I changed the address of the KERNELBASE? > > I hope you can help me here or point me in the right direction for > documentation. > > Thanks in advance for your comments. > > Kind regards, > Daniel > > PS. Please reply directly to me as I am not subscribed to the mailing list. > > ------------------------------------------------------------------------ > # > # Automatically generated make config: don't edit > # > > # > # Platform support > # > CONFIG_PPC=y > # CONFIG_6xx is not set > # CONFIG_PPC64 is not set > CONFIG_8xx=y > # CONFIG_MPC821 is not set > # CONFIG_MPC823 is not set > # CONFIG_MPC850 is not set > # CONFIG_MPC860 is not set > CONFIG_MPC860T=y > CONFIG_SERIAL_CONSOLE=y > # CONFIG_PMAC is not set > # CONFIG_PREP is not set > # CONFIG_CHRP is not set > # CONFIG_ALL_PPC is not set > # CONFIG_APUS is not set > CONFIG_MBX=y > # CONFIG_RPXLITE is not set > # CONFIG_RPXCLASSIC is not set > # CONFIG_BSEIP is not set > # CONFIG_SMP is not set > CONFIG_MACH_SPECIFIC=y > > # > # General setup > # > # CONFIG_EXPERIMENTAL is not set > CONFIG_MODULES=y > # CONFIG_MODVERSIONS is not set > CONFIG_KMOD=y > # CONFIG_PCI is not set > # CONFIG_PCI_QUIRKS is not set > CONFIG_NET=y > CONFIG_SYSCTL=y > CONFIG_SYSVIPC=y > # CONFIG_BSD_PROCESS_ACCT is not set > CONFIG_BINFMT_ELF=y > CONFIG_KERNEL_ELF=y > # CONFIG_BINFMT_MISC is not set > # CONFIG_BINFMT_JAVA is not set > # CONFIG_PARPORT is not set > # CONFIG_VGA_CONSOLE is not set > # CONFIG_FB is not set > > # > # Plug and Play support > # > # CONFIG_PNP is not set > > # > # Block devices > # > # CONFIG_BLK_DEV_FD is not set > CONFIG_BLK_DEV_IDE=y > > # > # Please see Documentation/ide.txt for help/info on IDE drives > # > # CONFIG_BLK_DEV_HD_IDE is not set > CONFIG_BLK_DEV_IDEDISK=y > CONFIG_BLK_DEV_IDECD=y > # CONFIG_BLK_DEV_IDETAPE is not set > # CONFIG_BLK_DEV_IDEFLOPPY is not set > # CONFIG_BLK_DEV_IDESCSI is not set > # CONFIG_BLK_DEV_CMD640 is not set > # CONFIG_IDE_CHIPSETS is not set > > # > # Additional Block Devices > # > # CONFIG_BLK_DEV_LOOP is not set > # CONFIG_BLK_DEV_NBD is not set > # CONFIG_BLK_DEV_MD is not set > CONFIG_BLK_DEV_RAM=y > CONFIG_BLK_DEV_INITRD=y > # CONFIG_BLK_DEV_XD is not set > CONFIG_PARIDE_PARPORT=y > # CONFIG_PARIDE is not set > # CONFIG_BLK_CPQ_DA is not set > # CONFIG_BLK_DEV_HD is not set > > # > # Networking options > # > CONFIG_PACKET=y > CONFIG_NETLINK=y > # CONFIG_RTNETLINK is not set > # CONFIG_NETLINK_DEV is not set > # CONFIG_FIREWALL is not set > # CONFIG_FILTER is not set > CONFIG_UNIX=y > CONFIG_INET=y > CONFIG_IP_MULTICAST=y > # CONFIG_IP_ADVANCED_ROUTER is not set > # CONFIG_IP_PNP is not set > # CONFIG_IP_ROUTER is not set > # CONFIG_NET_IPIP is not set > # CONFIG_NET_IPGRE is not set > # CONFIG_IP_MROUTE is not set > CONFIG_IP_ALIAS=y > # CONFIG_SYN_COOKIES is not set > > # > # (it is safe to leave these untouched) > # > CONFIG_INET_RARP=y > CONFIG_SKB_LARGE=y > > # > # > # > # CONFIG_IPX is not set > # CONFIG_ATALK is not set > > # > # SCSI support > # > # CONFIG_SCSI is not set > # CONFIG_SCSI_G_NCR5380_PORT is not set > # CONFIG_SCSI_G_NCR5380_MEM is not set > > # > # Network device support > # > CONFIG_NETDEVICES=y > > # > # ARCnet devices > # > # CONFIG_ARCNET is not set > # CONFIG_DUMMY is not set > # CONFIG_EQUALIZER is not set > # CONFIG_NET_SB1000 is not set > > # > # Ethernet (10 or 100Mbit) > # > CONFIG_NET_ETHERNET=y > # CONFIG_MACE is not set > # CONFIG_BMAC is not set > # CONFIG_NET_VENDOR_3COM is not set > # CONFIG_LANCE is not set > # CONFIG_NET_VENDOR_SMC is not set > # CONFIG_NET_VENDOR_RACAL is not set > # CONFIG_NET_ISA is not set > # CONFIG_NET_EISA is not set > # CONFIG_NET_POCKET is not set > # CONFIG_FDDI is not set > CONFIG_PPP=y > > # > # CCP compressors for PPP are only built as modules. > # > CONFIG_SLIP=y > # CONFIG_SLIP_COMPRESSED is not set > # CONFIG_SLIP_SMART is not set > # CONFIG_SLIP_MODE_SLIP6 is not set > # CONFIG_NET_RADIO is not set > > # > # Token ring devices > # > # CONFIG_TR is not set > # CONFIG_NET_FC is not set > > # > # Wan interfaces > # > # CONFIG_HOSTESS_SV11 is not set > # CONFIG_COSA is not set > # CONFIG_SEALEVEL_4021 is not set > # CONFIG_DLCI is not set > # CONFIG_WAN_DRIVERS is not set > # CONFIG_SBNI is not set > > # > # Amateur Radio support > # > # CONFIG_HAMRADIO is not set > > # > # ISDN subsystem > # > # CONFIG_ISDN is not set > > # > # Old CD-ROM drivers (not SCSI, not IDE) > # > # CONFIG_CD_NO_IDESCSI is not set > > # > # Console drivers > # > > # > # Character devices > # > CONFIG_VT=y > CONFIG_VT_CONSOLE=y > # CONFIG_SERIAL is not set > # CONFIG_SERIAL_EXTENDED is not set > # CONFIG_SERIAL_NONSTANDARD is not set > CONFIG_UNIX98_PTYS=y > CONFIG_UNIX98_PTY_COUNT=256 > # CONFIG_MOUSE is not set > # CONFIG_QIC02_TAPE is not set > # CONFIG_WATCHDOG is not set > # CONFIG_NVRAM is not set > # CONFIG_RTC is not set > > # > # Video For Linux > # > # CONFIG_VIDEO_DEV is not set > > # > # Joystick support > # > # CONFIG_JOYSTICK is not set > # CONFIG_DTLK is not set > > # > # Ftape, the floppy tape device driver > # > # CONFIG_FTAPE is not set > # CONFIG_FT_NORMAL_DEBUG is not set > # CONFIG_FT_FULL_DEBUG is not set > # CONFIG_FT_NO_TRACE is not set > # CONFIG_FT_NO_TRACE_AT_ALL is not set > # CONFIG_FT_STD_FDC is not set > # CONFIG_FT_MACH2 is not set > # CONFIG_FT_PROBE_FC10 is not set > # CONFIG_FT_ALT_FDC is not set > > # > # USB drivers - not for the faint of heart > # > > # > # Filesystems > # > # CONFIG_QUOTA is not set > # CONFIG_AUTOFS_FS is not set > # CONFIG_AFFS_FS is not set > # CONFIG_HFS_FS is not set > CONFIG_FAT_FS=y > CONFIG_MSDOS_FS=y > # CONFIG_UMSDOS_FS is not set > CONFIG_VFAT_FS=y > # CONFIG_ISO9660_FS is not set > # CONFIG_JOLIET is not set > # CONFIG_MINIX_FS is not set > # CONFIG_NTFS_FS is not set > # CONFIG_HPFS_FS is not set > CONFIG_PROC_FS=y > CONFIG_DEVPTS_FS=y > # CONFIG_ROMFS_FS is not set > CONFIG_EXT2_FS=y > # CONFIG_SYSV_FS is not set > # CONFIG_UFS_FS is not set > > # > # Network File Systems > # > # CONFIG_CODA_FS is not set > CONFIG_NFS_FS=y > CONFIG_SUNRPC=y > CONFIG_LOCKD=y > # CONFIG_SMB_FS is not set > # CONFIG_NCP_FS is not set > > # > # Partition Types > # > # CONFIG_BSD_DISKLABEL is not set > # CONFIG_MAC_PARTITION is not set > # CONFIG_SMD_DISKLABEL is not set > # CONFIG_SOLARIS_X86_PARTITION is not set > CONFIG_NLS=y > > # > # Native Language Support > # > CONFIG_NLS_CODEPAGE_437=y > # CONFIG_NLS_CODEPAGE_737 is not set > # CONFIG_NLS_CODEPAGE_775 is not set > # CONFIG_NLS_CODEPAGE_850 is not set > # CONFIG_NLS_CODEPAGE_852 is not set > # CONFIG_NLS_CODEPAGE_855 is not set > # CONFIG_NLS_CODEPAGE_857 is not set > # CONFIG_NLS_CODEPAGE_860 is not set > # CONFIG_NLS_CODEPAGE_861 is not set > # CONFIG_NLS_CODEPAGE_862 is not set > # CONFIG_NLS_CODEPAGE_863 is not set > # CONFIG_NLS_CODEPAGE_864 is not set > # CONFIG_NLS_CODEPAGE_865 is not set > # CONFIG_NLS_CODEPAGE_866 is not set > # CONFIG_NLS_CODEPAGE_869 is not set > # CONFIG_NLS_CODEPAGE_874 is not set > # CONFIG_NLS_ISO8859_1 is not set > # CONFIG_NLS_ISO8859_2 is not set > # CONFIG_NLS_ISO8859_3 is not set > # CONFIG_NLS_ISO8859_4 is not set > # CONFIG_NLS_ISO8859_5 is not set > # CONFIG_NLS_ISO8859_6 is not set > # CONFIG_NLS_ISO8859_7 is not set > # CONFIG_NLS_ISO8859_8 is not set > # CONFIG_NLS_ISO8859_9 is not set > # CONFIG_NLS_ISO8859_14 is not set > CONFIG_NLS_ISO8859_15=y > # CONFIG_NLS_KOI8_R is not set > > # > # Sound > # > # CONFIG_SOUND is not set > > # > # MPC8xx CPM Options > # > # CONFIG_SCC_ENET is not set > # CONFIG_FEC_ENET is not set > # CONFIG_CPM_IIC is not set > # CONFIG_UCODE_PATCH is not set > # CONFIG_RPXLCD is not set > > # > # Kernel hacking > # > # CONFIG_MAGIC_SYSRQ is not set > # CONFIG_KGDB is not set > # CONFIG_XMON is not set ** Sent via the linuxppc-embedded mail list. 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