L4Linux network and SD Access

Matthias Lange matthias.lange at kernkonzept.com
Thu Jun 29 22:39:04 CEST 2017 

Hi,

On 06/29/2017 10:11 PM, Daniel (Xiaolong) Wang wrote:
> Hi all,
> 
> I want to give L4Linux access to SD card, and ethernet driver.
> Initially I thought by run L4Linux kernel on top of L4re, drivers
> built with L4Linux kernel can just work. After trying and reading the
> email archive, seems like I need to configure the corresponding
> capability in cfg. I’m very new to L4re environment is there any
> tutorials or references that can help me understand it better? (I’m
> currently reading the manual, my development board is a beagle bone
> black)

In case of ARM platforms this is (still) not an easy undertaking. What
you have to do is basically this:

1. Enable the desired device drivers in your kernel configuration.
2. Make L4Linux compile.
3. Create a device tree which contains the device nodes of the desired
devices.
4. Create an io configuration for L4Re with the devices and their
resources and assign the desired devices to a vbus which is eventually
given to L4Linux. You can read about io and its configuration here [1].
5. Boot your setup on the target. At this stage, you usually you have to
instrument the device driver to debug the reasons why it is failing.

Best,
Matthias.

[1] http://l4re.org/doc/io.html

> 
> Also I’m trying to build a L4Linux with MMC driver. My configuration
> is based on default arm_defconfig. I enabled
> 
> * Make Linux be a Server * Bus driver for L4vbus * L4shm based
> network driver * MMC/SD/SDIO card support -> HW reset support for
> eMMC, MMC block device driver, Use bounce buffer for simple hosts,
> SDIO UART/GPS class support, Secure Digital Host Controller Interface
> Support, SDHCI platform and OF driver helper, MediaTek SD/MMC Card
> Interface support * DOS/FAT/NT Filesystem -> MSDOS fs support, VFAT
> fs support
> 
> however, when it build the following errors show did I do something
> wrong?
> 
> LD      drivers/i2c/busses/built-in.o LD
> drivers/i2c/muxes/built-in.o LD      drivers/i2c/built-in.o LD
> drivers/idle/built-in.o CC      drivers/input/input.o CC
> drivers/input/input-compat.o CC      drivers/input/input-mt.o CC
> drivers/input/ff-core.o LD      drivers/input/input-core.o CC
> drivers/input/mousedev.o CC      drivers/input/evdev.o LD
> drivers/input/built-in.o LD      drivers/iommu/built-in.o CC
> drivers/irqchip/irqchip.o LD      drivers/irqchip/built-in.o LD
> drivers/leds/built-in.o LD      drivers/lguest/built-in.o LD
> drivers/macintosh/built-in.o LD
> drivers/media/common/b2c2/built-in.o LD
> drivers/media/common/saa7146/built-in.o LD
> drivers/media/common/siano/built-in.o LD
> drivers/media/common/v4l2-tpg/built-in.o LD
> drivers/media/common/built-in.o LD
> drivers/media/firewire/built-in.o LD
> drivers/media/i2c/soc_camera/built-in.o LD
> drivers/media/i2c/built-in.o LD
> drivers/media/mmc/siano/built-in.o LD
> drivers/media/mmc/built-in.o LD
> drivers/media/pci/b2c2/built-in.o LD
> drivers/media/pci/ddbridge/built-in.o LD
> drivers/media/pci/dm1105/built-in.o LD
> drivers/media/pci/mantis/built-in.o LD
> drivers/media/pci/netup_unidvb/built-in.o LD
> drivers/media/pci/ngene/built-in.o LD
> drivers/media/pci/pluto2/built-in.o LD
> drivers/media/pci/pt1/built-in.o LD
> drivers/media/pci/pt3/built-in.o LD
> drivers/media/pci/saa7146/built-in.o LD
> drivers/media/pci/smipcie/built-in.o LD
> drivers/media/pci/ttpci/built-in.o LD
> drivers/media/pci/built-in.o LD
> drivers/media/platform/omap/built-in.o LD
> drivers/media/platform/built-in.o LD
> drivers/media/rc/keymaps/built-in.o LD
> drivers/media/rc/built-in.o LD      drivers/media/tuners/built-in.o 
> LD      drivers/media/usb/b2c2/built-in.o LD
> drivers/media/usb/dvb-usb/built-in.o LD
> drivers/media/usb/dvb-usb-v2/built-in.o LD
> drivers/media/usb/s2255/built-in.o LD
> drivers/media/usb/siano/built-in.o LD
> drivers/media/usb/stkwebcam/built-in.o LD
> drivers/media/usb/ttusb-budget/built-in.o LD
> drivers/media/usb/ttusb-dec/built-in.o LD
> drivers/media/usb/zr364xx/built-in.o LD
> drivers/media/usb/built-in.o LD      drivers/media/built-in.o LD
> drivers/mfd/built-in.o LD      drivers/misc/cb710/built-in.o LD
> drivers/misc/eeprom/built-in.o LD
> drivers/misc/lis3lv02d/built-in.o LD
> drivers/misc/mic/bus/built-in.o LD      drivers/misc/mic/built-in.o 
> LD      drivers/misc/ti-st/built-in.o LD
> drivers/misc/built-in.o CC      drivers/mmc/card/block.o CC
> drivers/mmc/card/queue.o LD      drivers/mmc/card/mmc_block.o CC
> drivers/mmc/card/sdio_uart.o LD      drivers/mmc/card/built-in.o CC
> drivers/mmc/core/core.o CC      drivers/mmc/core/bus.o CC
> drivers/mmc/core/host.o CC      drivers/mmc/core/mmc.o CC
> drivers/mmc/core/mmc_ops.o CC      drivers/mmc/core/sd.o CC
> drivers/mmc/core/sd_ops.o CC      drivers/mmc/core/sdio.o CC
> drivers/mmc/core/sdio_ops.o CC      drivers/mmc/core/sdio_bus.o CC
> drivers/mmc/core/sdio_cis.o CC      drivers/mmc/core/sdio_io.o CC
> drivers/mmc/core/sdio_irq.o CC      drivers/mmc/core/quirks.o CC
> drivers/mmc/core/slot-gpio.o CC      drivers/mmc/core/pwrseq.o CC
> drivers/mmc/core/debugfs.o LD      drivers/mmc/core/mmc_core.o CC
> drivers/mmc/core/pwrseq_simple.o CC
> drivers/mmc/core/pwrseq_emmc.o LD      drivers/mmc/core/built-in.o CC
> drivers/mmc/host/sdhci.o CC      drivers/mmc/host/mtk-sd.o CC
> drivers/mmc/host/sdhci-pltfm.o CC
> drivers/mmc/host/sdhci-of-arasan.o CC
> drivers/mmc/host/sdhci-of-at91.o LD      drivers/mmc/host/built-in.o 
> LD      drivers/mmc/built-in.o CC      drivers/net/Space.o CC
> drivers/net/loopback.o CC      drivers/net/l4shmnet.o LD
> drivers/net/built-in.o LD      drivers/nfc/built-in.o LD
> drivers/nvme/host/built-in.o LD      drivers/nvme/built-in.o CC
> drivers/of/base.o CC      drivers/of/device.o CC
> drivers/of/platform.o CC      drivers/of/fdt.o CC
> drivers/of/fdt_address.o CC      drivers/of/address.o CC
> drivers/of/irq.o CC      drivers/of/of_reserved_mem.o LD
> drivers/of/built-in.o LD      drivers/platform/built-in.o LD
> drivers/power/built-in.o LD      drivers/pwm/built-in.o CC
> drivers/rtc/rtc-lib.o LD      drivers/rtc/built-in.o LD
> drivers/soc/bcm/built-in.o LD      drivers/soc/fsl/built-in.o LD
> drivers/soc/built-in.o CC      drivers/tty/tty_io.o CC
> drivers/tty/n_tty.o CC      drivers/tty/tty_ioctl.o CC
> drivers/tty/tty_ldisc.o CC      drivers/tty/tty_buffer.o CC
> drivers/tty/tty_port.o CC      drivers/tty/tty_mutex.o CC
> drivers/tty/tty_ldsem.o CC      drivers/tty/pty.o CC
> drivers/tty/sysrq.o LD      drivers/tty/ipwireless/built-in.o CC
> drivers/tty/serial/serial_core.o CC      drivers/tty/serial/l4ser.o 
> CC      drivers/tty/serial/l4ser_shm.o LD
> drivers/tty/serial/built-in.o CC      drivers/tty/vt/vt_ioctl.o CC
> drivers/tty/vt/vc_screen.o CC      drivers/tty/vt/selection.o CC
> drivers/tty/vt/keyboard.o CC      drivers/tty/vt/consolemap.o CC
> drivers/tty/vt/consolemap_deftbl.o CC      drivers/tty/vt/vt.o CC
> drivers/tty/vt/defkeymap.o LD      drivers/tty/vt/built-in.o LD
> drivers/tty/built-in.o LD      drivers/video/backlight/built-in.o CC
> drivers/video/console/dummycon.o CC
> drivers/video/console/fbcon.o CC
> drivers/video/console/bitblit.o CC
> drivers/video/console/softcursor.o LD
> drivers/video/console/built-in.o CC
> drivers/video/fbdev/core/fb_cmdline.o CC
> drivers/video/fbdev/core/fb_notify.o CC
> drivers/video/fbdev/core/fbmem.o CC
> drivers/video/fbdev/core/fbmon.o CC
> drivers/video/fbdev/core/fbcmap.o CC
> drivers/video/fbdev/core/fbsysfs.o CC
> drivers/video/fbdev/core/modedb.o CC
> drivers/video/fbdev/core/fbcvt.o LD
> drivers/video/fbdev/core/fb.o LD
> drivers/video/fbdev/core/built-in.o LD
> drivers/video/fbdev/omap2/omapfb/displays/built-in.o LD
> drivers/video/fbdev/omap2/omapfb/dss/built-in.o LD
> drivers/video/fbdev/omap2/omapfb/built-in.o LD
> drivers/video/fbdev/omap2/built-in.o LD
> drivers/video/fbdev/built-in.o CC      drivers/video/logo/logo.o LOGO
> drivers/video/logo/logo_linux_mono.c CC
> drivers/video/logo/logo_linux_mono.o LOGO
> drivers/video/logo/logo_linux_vga16.c CC
> drivers/video/logo/logo_linux_vga16.o LOGO
> drivers/video/logo/logo_linux_clut224.c CC
> drivers/video/logo/logo_linux_clut224.o LD
> drivers/video/logo/built-in.o LOGO
> drivers/video/logo/logo_superh_mono.c LOGO
> drivers/video/logo/clut_vga16.c LOGO
> drivers/video/logo/logo_blackfin_vga16.c LOGO
> drivers/video/logo/logo_superh_vga16.c LOGO
> drivers/video/logo/logo_blackfin_clut224.c LOGO
> drivers/video/logo/logo_dec_clut224.c LOGO
> drivers/video/logo/logo_m32r_clut224.c LOGO
> drivers/video/logo/logo_mac_clut224.c LOGO
> drivers/video/logo/logo_parisc_clut224.c LOGO
> drivers/video/logo/logo_sgi_clut224.c LOGO
> drivers/video/logo/logo_spe_clut224.c LOGO
> drivers/video/logo/logo_sun_clut224.c LOGO
> drivers/video/logo/logo_superh_clut224.c LD
> drivers/video/built-in.o LD      drivers/built-in.o LD
> sound/built-in.o LD      firmware/built-in.o CC
> arch/l4/drivers/vbus/l4vbus.o LD
> arch/l4/drivers/vbus/built-in.o CC      arch/l4/drivers/events.o LD
> arch/l4/drivers/built-in.o CC      net/socket.o LD
> net/802/built-in.o CC      net/core/sock.o CC
> net/core/request_sock.o CC      net/core/skbuff.o CC
> net/core/datagram.o CC      net/core/stream.o CC      net/core/scm.o 
> CC      net/core/gen_stats.o CC      net/core/gen_estimator.o CC
> net/core/net_namespace.o CC      net/core/secure_seq.o CC
> net/core/flow_dissector.o CC      net/core/sysctl_net_core.o CC
> net/core/dev.o CC      net/core/ethtool.o CC
> net/core/dev_addr_lists.o CC      net/core/dst.o CC
> net/core/netevent.o CC      net/core/neighbour.o CC
> net/core/rtnetlink.o CC      net/core/utils.o CC
> net/core/link_watch.o CC      net/core/filter.o CC
> net/core/sock_diag.o CC      net/core/dev_ioctl.o CC
> net/core/tso.o CC      net/core/sock_reuseport.o CC
> net/core/flow.o CC      net/core/net-sysfs.o CC
> net/core/net-procfs.o LD      net/core/built-in.o CC
> net/ethernet/eth.o LD      net/ethernet/built-in.o CC
> net/ipv4/route.o CC      net/ipv4/inetpeer.o CC
> net/ipv4/protocol.o CC      net/ipv4/ip_input.o CC
> net/ipv4/ip_fragment.o CC      net/ipv4/ip_forward.o CC
> net/ipv4/ip_options.o CC      net/ipv4/ip_output.o CC
> net/ipv4/ip_sockglue.o CC      net/ipv4/inet_hashtables.o CC
> net/ipv4/inet_timewait_sock.o CC
> net/ipv4/inet_connection_sock.o CC      net/ipv4/tcp.o CC
> net/ipv4/tcp_input.o CC      net/ipv4/tcp_output.o CC
> net/ipv4/tcp_timer.o CC      net/ipv4/tcp_ipv4.o CC
> net/ipv4/tcp_minisocks.o CC      net/ipv4/tcp_cong.o CC
> net/ipv4/tcp_metrics.o CC      net/ipv4/tcp_fastopen.o CC
> net/ipv4/tcp_recovery.o CC      net/ipv4/tcp_offload.o CC
> net/ipv4/datagram.o CC      net/ipv4/raw.o CC      net/ipv4/udp.o CC
> net/ipv4/udplite.o CC      net/ipv4/udp_offload.o CC
> net/ipv4/arp.o CC      net/ipv4/icmp.o CC      net/ipv4/devinet.o CC
> net/ipv4/af_inet.o CC      net/ipv4/igmp.o CC
> net/ipv4/fib_frontend.o CC      net/ipv4/fib_semantics.o CC
> net/ipv4/fib_trie.o CC      net/ipv4/inet_fragment.o CC
> net/ipv4/ping.o CC      net/ipv4/ip_tunnel_core.o CC
> net/ipv4/gre_offload.o CC      net/ipv4/sysctl_net_ipv4.o CC
> net/ipv4/proc.o CC      net/ipv4/xfrm4_mode_beet.o CC
> net/ipv4/xfrm4_mode_transport.o CC      net/ipv4/xfrm4_mode_tunnel.o 
> CC      net/ipv4/ipconfig.o CC      net/ipv4/inet_diag.o CC
> net/ipv4/tcp_diag.o CC      net/ipv4/tcp_cubic.o CC
> net/ipv4/xfrm4_policy.o CC      net/ipv4/xfrm4_state.o CC
> net/ipv4/xfrm4_input.o CC      net/ipv4/xfrm4_output.o CC
> net/ipv4/xfrm4_protocol.o LD      net/ipv4/built-in.o CC
> net/ipv6/addrconf_core.o CC      net/ipv6/exthdrs_core.o CC
> net/ipv6/ip6_checksum.o CC      net/ipv6/ip6_icmp.o CC
> net/ipv6/output_core.o CC      net/ipv6/protocol.o CC
> net/ipv6/ip6_offload.o CC      net/ipv6/tcpv6_offload.o CC
> net/ipv6/exthdrs_offload.o LD      net/ipv6/built-in.o CC
> net/netlink/af_netlink.o CC      net/netlink/genetlink.o LD
> net/netlink/built-in.o CC      net/packet/af_packet.o LD
> net/packet/built-in.o CC      net/sched/sch_generic.o CC
> net/sched/sch_mq.o LD      net/sched/built-in.o CC
> net/unix/af_unix.o CC      net/unix/garbage.o CC
> net/unix/sysctl_net_unix.o LD      net/unix/unix.o LD
> net/unix/built-in.o CC      net/xfrm/xfrm_policy.o CC
> net/xfrm/xfrm_state.o CC      net/xfrm/xfrm_hash.o CC
> net/xfrm/xfrm_input.o CC      net/xfrm/xfrm_output.o CC
> net/xfrm/xfrm_sysctl.o CC      net/xfrm/xfrm_replay.o LD
> net/xfrm/built-in.o CC      net/sysctl_net.o LD      net/built-in.o 
> CC      lib/lockref.o CC      lib/bcd.o CC      lib/div64.o CC
> lib/sort.o CC      lib/parser.o CC      lib/halfmd4.o CC
> lib/debug_locks.o CC      lib/random32.o CC
> lib/bust_spinlocks.o CC      lib/kasprintf.o CC      lib/bitmap.o CC
> lib/scatterlist.o CC      lib/gcd.o CC      lib/lcm.o CC
> lib/list_sort.o CC      lib/uuid.o CC      lib/flex_array.o CC
> lib/iov_iter.o CC      lib/clz_ctz.o CC      lib/bsearch.o CC
> lib/find_bit.o CC      lib/llist.o CC      lib/memweight.o CC
> lib/kfifo.o CC      lib/percpu-refcount.o CC      lib/percpu_ida.o CC
> lib/rhashtable.o CC      lib/reciprocal_div.o CC      lib/once.o CC
> lib/string_helpers.o CC      lib/hexdump.o CC      lib/kstrtox.o CC
> lib/pci_iomap.o CC      lib/iomap_copy.o CC      lib/devres.o CC
> lib/hweight.o CC      lib/bitrev.o CC      lib/crc16.o HOSTCC
> lib/gen_crc32table GEN     lib/crc32table.h CC      lib/crc32.o CC
> lib/genalloc.o CC      lib/fonts/fonts.o CC
> lib/fonts/font_8x8.o CC      lib/fonts/font_8x16.o LD
> lib/fonts/font.o LD      lib/fonts/built-in.o CC
> lib/lz4/lz4_decompress.o LD      lib/lz4/built-in.o CC
> lib/lzo/lzo1x_decompress_safe.o LD      lib/lzo/lzo_decompress.o LD
> lib/lzo/built-in.o CC      lib/xz/xz_dec_syms.o CC
> lib/xz/xz_dec_stream.o CC      lib/xz/xz_dec_lzma2.o CC
> lib/xz/xz_dec_bcj.o LD      lib/xz/xz_dec.o LD
> lib/xz/built-in.o CC      lib/zlib_inflate/inffast.o CC
> lib/zlib_inflate/inflate.o CC      lib/zlib_inflate/infutil.o CC
> lib/zlib_inflate/inftrees.o CC      lib/zlib_inflate/inflate_syms.o 
> LD      lib/zlib_inflate/zlib_inflate.o LD
> lib/zlib_inflate/built-in.o CC      lib/swiotlb.o CC
> lib/iommu-helper.o CC      lib/iommu-common.o CC      lib/syscall.o 
> CC      lib/nlattr.o CC      lib/dynamic_queue_limits.o CC
> lib/net_utils.o LD      lib/built-in.o CC      lib/argv_split.o CC
> lib/bug.o CC      lib/cmdline.o CC      lib/ctype.o CC
> lib/dec_and_lock.o CC      lib/decompress.o CC
> lib/decompress_bunzip2.o CC      lib/decompress_inflate.o CC
> lib/decompress_unlz4.o CC      lib/decompress_unlzma.o CC
> lib/decompress_unlzo.o CC      lib/decompress_unxz.o CC
> lib/dma-noop.o CC      lib/dump_stack.o CC      lib/earlycpio.o CC
> lib/extable.o CC      lib/fdt.o CC      lib/fdt_empty_tree.o CC
> lib/fdt_ro.o CC      lib/fdt_rw.o CC      lib/fdt_strerror.o CC
> lib/fdt_sw.o CC      lib/fdt_wip.o CC      lib/flex_proportions.o CC
> lib/idr.o CC      lib/int_sqrt.o CC      lib/ioremap.o CC
> lib/irq_regs.o CC      lib/is_single_threaded.o CC      lib/klist.o 
> CC      lib/kobject.o CC      lib/kobject_uevent.o CC      lib/md5.o 
> CC      lib/nmi_backtrace.o CC      lib/nodemask.o CC
> lib/plist.o CC      lib/radix-tree.o CC      lib/ratelimit.o CC
> lib/rbtree.o CC      lib/seq_buf.o CC      lib/sha1.o CC
> lib/show_mem.o CC      lib/string.o CC      lib/timerqueue.o CC
> lib/vsprintf.o AR      lib/lib.a CC
> arch/l4/lib/arch-arm/../proc.o CC
> arch/l4/lib/arch-arm/../debugfs.o LD
> arch/l4/lib/arch-arm/built-in.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/ashldi3.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/ashrdi3.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/backtrace.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/bswapsdi2.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/call_with_stack.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/changebit.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/clearbit.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/copy_page.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/csumipv6.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/csumpartial.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/csumpartialcopy.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/delay-loop.o CC
> arch/l4/lib/arch-arm/../../../arm/lib/delay.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/div64.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/findbit.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/io-readsb.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/io-readsl.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/io-readsw-armv4.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/io-writesb.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/io-writesl.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/io-writesw-armv4.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/lib1funcs.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/lshrdi3.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/memchr.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/memcpy.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/memmove.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/memset.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/memzero.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/muldi3.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/setbit.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/strchr.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/strrchr.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/testchangebit.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/testclearbit.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/testsetbit.o AS
> arch/l4/lib/arch-arm/../../../arm/lib/ucmpdi2.o CC
> arch/l4/lib/arch-arm/../csumpartialcopyuser.o CC
> arch/l4/lib/arch-arm/../memcpy_user.o CC
> arch/l4/lib/arch-arm/../pte.o CC
> arch/l4/lib/arch-arm/../uaccess.o AR      arch/l4/lib/arch-arm/lib.a 
> LD      arch/l4/l4lxlib/generic/built-in.o CC
> arch/l4/l4lxlib/generic/irq_gen.o CC
> arch/l4/l4lxlib/generic/legacy.o CC
> arch/l4/l4lxlib/generic/thread_gen.o AR
> arch/l4/l4lxlib/generic/lib.a LD
> arch/l4/l4lxlib/l4env/built-in.o CC
> arch/l4/l4lxlib/l4env/irq_vcpu.o CC
> arch/l4/l4lxlib/l4env/memory.o CC      arch/l4/l4lxlib/l4env/misc.o 
> CC      arch/l4/l4lxlib/l4env/task.o CC
> arch/l4/l4lxlib/l4env/thread.o AR      arch/l4/l4lxlib/l4env/lib.a LD
> virt/lib/built-in.o LD      virt/built-in.o LINK    vmlinux LD
> vmlinux.o MODPOST vmlinux.o GEN     .version CHK
> include/generated/compile.h UPD     include/generated/compile.h CC
> init/version.o LD      init/built-in.o drivers/built-in.o: In
> function `sdhci_at91_probe': 
> /home/daniel/Desktop/l4re-snapshot/src/l4linux/build-arm/../drivers/mmc/host/sdhci-of-at91.c:212:
> undefined reference to `clk_set_rate' make[1]: *** [vmlinux] Error 1 
> make[1]: Leaving directory
> `/home/daniel/Desktop/l4re-snapshot/src/l4linux/build-arm' make: ***
> [sub-make] Error 2
> 
> 
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