recompile linux kernel

Hi,

can the xilinx_zynq_defconfig kernel and the zynq-zc702.dts device tree configuration from the linux-xlnx.git repository be used for the Zedboard as-is, or are any modifications required?  If so, precisely what modifications are required?  Can they be made available in a git repository by any chance?

I.e.:

git clone git://git.xilinx.com/linux-xlnx.git
cd linux-xlnx
make ARCH=arm xilinx_zynq_defconfig
make ARCH=arm
scripts/dtc/dtc -I dts -O dtb -o arch/arm/boot/devicetree_ramdisk.dtb arch/arm/boot/dts/zynq-zc702.dts
cd arch/arm/boot
<copy zImage and devicetree_ramdisk.dtb to zedboard>
<reboot & profit>

I'm asking because I followed these steps, but the kernel won't boot - It hangs during the boot process (log below).  When I remove the i2c device from the device tree, it goes a bit further but still does not work (i.e. the userland segfaults).

It would be very helpful if there was a description (and configuration file) that makes it possible to rebuild the kernel as distributed, as starting point.  Also, it would be very nice if there was a description how to rebuild u-boot with the factory default bitstream.  And a description how to rebuild the factory default bitstream with, erm, ISE?  EDK?  I know I'm asking for a lot :)

Any help would be appreciated.
-Hans


U-Boot 2011.03-dirty (Jul 11 2012 - 16:07:00)

DRAM:  512 MiB
MMC:   SDHCI: 0
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   zynq_gem
Hit any key to stop autoboot:  0
Copying Linux from SD to RAM...
Device: SDHCI
Manufacturer ID: 12
OEM: 3456
Name: SMI  
Tran Speed: 25000000
Rd Block Len: 512
SD version 1.10
High Capacity: Yes
Capacity: 3967811584
Bus Width: 1-bit
reading zImage

2303280 bytes read
reading devicetree_ramdisk.dtb

3972 bytes read
reading ramdisk8M.image.gz

3699979 bytes read
## Starting application at 0x00008000 ...
Uncompressing Linux... done, booting the kernel.
Booting Linux on physical CPU 0
Linux version 3.3.0-14.2-build1-01491-g42fac65 (hans@aspirin) (gcc version 4.5.1 (Sourcery G++ Lite 2010.09-62) ) #1 SMP PREEMPT Thu Sep 6 07:02:02 EDT 2012
CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=18c5387d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: Xilinx Zynq Platform, model: Xilinx Zynq ZC702
bootconsole [earlycon0] enabled
Memory policy: ECC disabled, Data cache writealloc
PERCPU: Embedded 7 pages/cpu @c190b000 s5696 r8192 d14784 u32768
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 259840
Kernel command line: console=ttyPS0,115200 root=/dev/ram rw initrd=0x800000,8M ip=:::::eth0:dhcp earlyprintk
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 1024MB = 1024MB total
Memory: 1025632k/1025632k available, 22944k reserved, 270336K highmem
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    vmalloc : 0xf0000000 - 0xff000000   ( 240 MB)
    lowmem  : 0xc0000000 - 0xef800000   ( 760 MB)
    pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
    modules : 0xbf000000 - 0xbfe00000   (  14 MB)
      .text : 0xc0008000 - 0xc0412250   (4137 kB)
      .init : 0xc0413000 - 0xc0438640   ( 150 kB)
      .data : 0xc043a000 - 0xc0467ca0   ( 184 kB)
       .bss : 0xc0467cc4 - 0xc0481edc   ( 105 kB)
Preemptible hierarchical RCU implementation.
tVerbose stalled-CPUs detection is disabled.
NR_IRQS:128
xlnx,ps7-ttc-1.00.a #0 at 0xf0000000, irq=43
Console: colour dummy device 80x30
Calibrating delay loop... 1332.01 BogoMIPS (lpj=6660096)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
smp_twd: clock not found: -2
Calibrating local timer... 333.55MHz.
hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available
Setting up static identity map for 0x2f9e50 - 0x2f9e84
CPU1: Booted secondary processor
CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
Brought up 2 CPUs
SMP: Total of 2 processors activated (2664.03 BogoMIPS).
devtmpfs: initialized
NET: Registered protocol family 16
L310 cache controller enabled
l2x0: 8 ways, CACHE_ID 0x410000c8, AUX_CTRL 0x72060000, Cache size: 524288 B
registering platform device 'pl330' id 0
registering platform device 'arm-pmu' id 0
hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
hw-breakpoint: maximum watchpoint size is 4 bytes.
xslcr xslcr.0: at 0xF8000000 mapped to 0xF0008000
bio: create slab <bio-0> at 0
gpiochip_add: registered GPIOs 0 to 245 on device: xgpiops
xgpiops e000a000.gpio: gpio at 0xe000a000 mapped to 0xf000a000
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Switching to clocksource xttcpss_timer1
NET: Registered protocol family 2
IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 7, 786432 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
TCP reno registered
UDP hash table entries: 512 (order: 2, 16384 bytes)
UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Trying to unpack rootfs image as initramfs...
rootfs image is not initramfs (no cpio magic); looks like an initrd
Freeing initrd memory: 8192K
xscugtimer xscugtimer.0: ioremap fe00c200 to f000c200 with size 400
pl330 dev 0 probe success
highmem bounce pool size: 64 pages
JFFS2 version 2.2. (NAND) (SUMMARY)  u00A9 2001-2006 Red Hat, Inc.
msgmni has been set to 1491
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
e00??u037D??[ttyPS0] enabled, bootconsole disabled
console [ttyPS0] enabled, bootconsole disabled
xdevcfg f8007000.devcfg: ioremap f8007000 to f0060000 with size 100
brd: module loaded
loop: module loaded
m25p80 spi1.0: found s25fl256s1, expected n25q128
m25p80 spi1.0: s25fl256s1 (32768 Kbytes)
7 ofpart partitions found on MTD device spi1.0
Creating 7 MTD partitions on "spi1.0":
0x000000000000-0x000000080000 : "qspi-fsbl"
0x000000080000-0x000000100000 : "qspi-u-boot"
0x000000100000-0x000000600000 : "qspi-linux"
0x000000600000-0x000000620000 : "qspi-device-tree"
0x000000620000-0x000000700000 : "qspi-user"
0x000000700000-0x000000800000 : "qspi-scratch"
0x000000800000-0x000001000000 : "qspi-rootfs"
xqspips e000d000.spi: at 0xE000D000 mapped to 0xF0062000, irq=51
GEM: BASEADDRESS hw: e000b000 virt: f0064000
XEMACPS mii bus: probed
mdio_bus e000b000: error probing PHY at address 7
eth0, pdev->id -1, baseaddr 0xe000b000, irq 54
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
xusbps-ehci xusbps-ehci.0: Xilinx PS USB EHCI Host Controller
xusbps-ehci xusbps-ehci.0: new USB bus registered, assigned bus number 1
xusbps-ehci xusbps-ehci.0: irq 53, io mem 0x00000000
xusbps-ehci xusbps-ehci.0: USB 2.0 started, EHCI 1.00
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
Xilinx PS USB Device Controller driver (Apr 01, 2011)
mousedev: PS/2 mouse device common for all mice
i2c /dev entries driver
xi2cps e0004000.i2c: 100 kHz mmio e0004000 irq 57
(hangs here)

To answer my own question:  I picked the required pieces and information from various Web pages and with that, I was able to configure and build a kernel and a device tree.  I added a new device tree generation file for the zedboard (arch/arm/boot/dts/zynq-zedboard.dts) to my kernel repository (https://github.com/hanshuebner/linux-xlnx). Now in theory, this should work:

git clone https://github.com/hanshuebner/linux-xlnx.git
cd linux-xlnx
make ARCH=arm xilinx_zynq_defconfig
make ARCH=arm
scripts/dtc/dtc -I dts -O dtb -o arch/arm/boot/devicetree_ramdisk.dtb arch/arm/boot/dts/zynq-zedboard.dts
cd arch/arm/boot
<copy zImage and devicetree_ramdisk.dtb to zedboard>
<reboot & profit>

The original source for the device tree configuration is here: http://zynqlab.blogspot.com.au/

hans,

Have you confirmed this boots on hardware?

hans,

Have you confirmed this boots on hardware?

Sure, I've done all my experiments with the real Zedboard so far.