Hi guys, I've been working off your suggestions and here's my update on where I'm at now.
For reference, attached are my current
"linux-2.6-denx/arch/powerpc/boot/dts/ep88xc.dts" and
"u-boot-2009.03/include/configs/EP88x.h".
> I might be able to help out. Scott's right. According to U-Boots
> include/configs/EP88x.h,
> CONFIG_SYS_IMMR is 0xf0000000, but the Linux the ep88xc.dts is
> referring to an IMMR set
> to 0xfa200000. Replace every instance of 0xfa20 with 0xf000, and it may work.
I did notice the IMMR discrepancy and as Frank suggested adjusted the
0xfa20xxxx values to 0xf000xxxx in my DTS, though I'm wondering if it
would be better to have just set my CONFIG_SYS_IMMR to 0xfa200000? Not
sure if that would break more than it would fix. Anyways, I have not
noticed any difference in output after changing this in the DTS, but
I'll leave it this way as it seems more correct.
>>> Also, make sure u-boot is properly updating the memory size in the device
>>> tree. Can you dump the post-fixup device tree in u-boot?
>> Not sure, but I'll try to find out if that's possible. It'd certainly
>> answer a lot of questions...
While I have not yet figured out how to dump the post-fixup tree... I
can see that U-Boot doesn't seem to be doing proper fixup because
after manually setting all the DTS fields that U-Boot was supposed to
fill in (clock frequency, RAM start/end, etc.), the kernel seems to be
going through a fairly normal boot sequence. Without me manually
setting those fields, they remain initialized to 0. The only issue is
that no output goes to the console.
Here is my current output.
>From U-Boot:
U-Boot 2009.03-svn8591 (Jun 29 2009 - 11:25:23)
CPU: MPC885ZPnn at 100 MHz [40.0...133.0 MHz]
8 kB I-Cache 8 kB D-Cache FEC present
Board: EP88xC 1.1 CPLD revision 2
DRAM: 64 MB
FLASH: 32 MB
In: serial
Out: serial
Err: serial
Net: FEC ETHERNET, FEC2 ETHERNET
Hit any key to stop autoboot: 0
=> tftp ep88x_uimage2
Using FEC ETHERNET device
TFTP from server 10.0.54.129; our IP address is 10.0.54.150
Filename 'ep88x_uimage2'.
Load address: 0x400000
Loading: #################################################################
########
done
Bytes transferred = 1057419 (10228b hex)
=> tftp 750000 ep88x_dtb2
Using FEC ETHERNET device
TFTP from server 10.0.54.129; our IP address is 10.0.54.150
Filename 'ep88x_dtb2'.
Load address: 0x750000
Loading: #
done
Bytes transferred = 7725 (1e2d hex)
=> bootm 400000 - 750000
## Booting kernel from Legacy Image at 00400000 ...
Image Name: Linux-2.6.30-rc2-01402-gd4e2f68-
Image Type: PowerPC Linux Kernel Image (gzip compressed)
Data Size: 1057355 Bytes = 1 MB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
## Flattened Device Tree blob at 00750000
Booting using the fdt blob at 0x750000
Uncompressing Kernel Image ... OK
>From Kernel via postmortem analysis - sorry it's a little messy, my
debugger ICDPPCZ is not that great at producing memory dumps so I had
to do some cleanup/conversion to make the results at least somewhat
legible:
<6>Using Embedded Planet EP88xC machine description?
<5>Linux version 2.6.30-rc2-??1402-gd4e2f68-dirty
(dev...@localhost.localdomain) (gcc version 4.2.2) #1 Mon J??n 29
11:35:28 CDT 2009?
<7>Top of RAM: 0x4000000' Total RAM: 0x4000000?
<7>Memory??hole size: 0MB?
<4>Zone PFN ranges:?
<4> DMA 0x00000000 -> 0x00004000?
<4> ??ormal 0x00004000 -> 0x00004000?
<4>Movable zone start PFN for each node?
<4>ear??y_node_map[1] active PFN ranges?
<4> 0: 0x00000000 -> 0x00004000?
<7>On node 0??totalpages: 16384?
<7>free_area_init_node: node 0' pgdat c021bf7c' node_mem_map ??023f000?
<7> DMA zone: 128 pages used for memmap?
<7> DMA zone: 0 pages reserve???
<7> DMA zone: 16256 pages' LIFO batch:3?
<6>MMU: Allocated 72 bytes of context??maps for 16 contexts?
<4>Built 1 zonelists in Zone order' mobility grouping on. ??Total pages: 16256?
<5>Kernel command line: console=ttyS0'9600n8 loglevel=7?
<6>N??_IRQS:512?
<7>irq: irq 5 on host /s...@f0000000/interrupt-control...@0 mapped to
??irtual irq 16?
<7>irq: irq 0 on host /s...@f0000000/c...@9c0/interrupt-control...@??30
mapped to virtual irq 17?
<4>PID hash table entries: 256 (order: 8' 1024 byte??)?
<4>Decrementer Frequency = 0x7bfa48?
<7>irq: irq 15 on host /s...@f0000000/inte??rupt-control...@0 mapped to
virtual irq 18?
<7>time_init: decrementer frequency ?? 8.125000 MHz?
<7>time_init: processor frequency = 130.000000 MHz?
<6>clocksour??e: timebase mult[1ec4ec4f] shift[22] registered?
<7>clockevent: decrementer mult??214] shift[16] cpu[0]?
<6>Dentry cache hash table entries: 8192 (order: 3' 32768??bytes)?
<6>Inode-cache hash table entries: 4096 (order: 2' 16384 bytes)?
<6>Memor??: 62532k/65536k available (2064k kernel code' 2940k
reserved' 100k data' 99k bs??' 96k init)?
<6>SLUB: Genslabs=12' HWalign=16' Order=0-3' MinObjects=0' CPUs=1' ??odes=1?
<6>Calibrating delay loop... 16.12 BogoMIPS (lpj=80640)?
<4>Mount-cache h??sh table entries: 512?
<6>net_namespace: 296 bytes?
<6>NET: Registered protocol f??mily 16?
<4>bio: create slab <bio-0> at 0?
<7>Switched to high resolution mode on??CPU 0?
<6>NET: Registered protocol family 2?
<6>IP route cache hash table entries?? 1024 (order: 0' 4096 bytes)?
<6>TCP established hash table entries: 2048 (order?? 2' 16384 bytes)?
<6>TCP bind hash table entries: 2048 (order: 1' 8192 bytes)?
<6??TCP: Hash tables configured (established 2048 bind 2048)?
<6>TCP reno registered??
<6>NET: Registered protocol family 1?
<6>msgmni has been set to 122?
<6>io schedu??er noop registered?
<6>io scheduler deadline registered (default)?
<6>Generic RTC??Driver v1.07?
<7>irq: irq 4 on host /s...@f0000000/c...@9c0/interrupt-control...@9??0
mapped to virtual irq 19?
<6>f0000a80.serial: ttyCPM0 at MMIO 0xc500ea80 (irq ?? 19) is a CPM UART?
<7>irq: irq 29 on host /s...@f0000000/c...@9c0/interrupt-contr??l...@930
mapped to virtual irq 29?
<6>f0000a20.serial: ttyCPM1 at MMIO 0xc501aa2?? (irq = 29) is a CPM UART?
<7>irq: irq 3 on host /s...@f0000000/interrupt-control?...@0 mapped to
virtual irq 20?
<6>eth0: fs_enet: 00:00:00:00:00:00?
<7>irq: irq 7??on host /s...@f0000000/interrupt-control...@0 mapped to
virtual irq 21?
<6>eth1: ??s_enet: 00:00:00:00:00:00?
<6>FEC MII Bus: probed?
<6>fe000000.flash: Found 2 x16??devices at 0x0 in 32-bit bank?
<4> Amd/Fujitsu Extended Query Table at 0x0040?
<4??fe000000.flash: CFI does not contain boot bank location. Assuming top.?
<5>numbe?? of CFI chips: 1?
<5>cfi_cmdset_0002: Disabling erase-suspend-program due to cod?? brokenness.?
<6>TCP cubic registered?
<6>NET: Registered protocol family 17?
<6>R??C: Registered udp transport module.?
<6>RPC: Registered tcp transport module.?
<3??Root-NFS: No NFS server available' giving up.?
<3>VFS: Unable to mount root fs v??a NFS' trying floppy.?
<4>VFS: Cannot open root device "<NULL>" or unknown-block??2'0)?
<4>Please append a correct "root=" boot option; here are the available
par??itions:?
<4>1f00 32768 mtdblock0 driver: of-flash?
<0>Kernel panic - no?? syncing: VFS: Unable to mount root fs on
unknown-block(2'0)?
<4>Call Trace:?
<4>??c381fed0] [c00069e0] show_stack+0x44/0x16c (unreliable)?
<4>[c381ff10] [c001bc6c?? panic+0x8c/0x168?
<4>[c381ff60] [c01ecb80] mount_block_root+0x12c/0x244?
<4>[c38??ffb0] [c01ecdf4] prepare_namespace+0x4c/0x1c4?
<4>[c381ffd0] [c01ec1b0] kernel_i??it+0xd0/0xfc?
<4>[c381fff0] [c000da60] kernel_thread+0x4c/0x68?
<0>Rebooting in 1??0 seconds..?????????????????????????????????
At this point, my primary goal is to get console output working before
I do anything else. I've tried different "console=x" boot arguments
and I've added the "chosen" section to my DTS, but still no output.
Anyone have suggestions about this? Is something else messed up in my
DTS?
Thanks,
Mikhail Zaturenskiy
ep88xc.dts
Description: Binary data
EP88x.h
Description: Binary data
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