Hi,
I have built a 64 bit kernel for BCM1250.
When the kernel is loaded and control is passed to
kernel_entry there is an exception:
CFE> boot -elf LinuxServer:vmlinux.64
Loader:elf Filesys:tftp Dev:eth2
File:LinuxServer:vmlinux.64 Options:(null)
Loading: 0xffffffff80100000/2162688
0xffffffff80310000/557344 Entry at 0xffffffff802d0000
Closing network.
Starting program at 0xffffffff802d0000
**Exception 8: EPC=FFFFFFFF802D003C, Cause=0000900C
(TLBMissWr)
RA=FFFFFFFF9FC0086C,
VAddr=0000000000000000
0 ($00) = 0000000000000000 AT ($01) =
0000000000000000
v0 ($02) = 0000000000000080 v1 ($03) =
0000000000000003
a0 ($04) = FFFFFFFF81F07FF0 a1 ($05) =
0000000000000000
a2 ($06) = FFFFFFFF9FC008E8 a3 ($07) =
0000000043464531
t0 ($08) = FFFFFFFF802D0000 t1 ($09) =
FFFFFFFF81F01DB8
t2 ($10) = FFFFFFFFA0008000 t3 ($11) =
0000000000008000
t4 ($12) = 0000000000000000 t5 ($13) =
FFFFFFFF81F18E60
t6 ($14) = FFFFFFFF81F14A20 t7 ($15) =
000000000000000A
s0 ($16) = FFFFFFFF9FC0086C s1 ($17) =
FFFFFFFF81F01D20
s2 ($18) = FFFFFFFF820036F8 s3 ($19) =
FFFFFFFF81F00000
s4 ($20) = FFFFFFFF820036E8 s5 ($21) =
FFFFFFFFFFFFFFFF
s6 ($22) = 0000000000000000 s7 ($23) =
0000000000000000
t8 ($24) = 0000000010000000 t9 ($25) =
FFFFFFFF9FC46430
k0 ($26) = FFFFFFFF81F22E28 k1 ($27) =
FFFFFFFF81F1F098
gp ($28) = FFFFFFFF81F07FF0 sp ($29) =
FFFFFFFF82003550
fp ($30) = 0000000000000000 ra ($31) =
FFFFFFFF9FC0086C
The code where the exception occurs is:
ffffffff802d0000 <kernel_entry>:
ffffffff802d0000: 400c6000 mfc0
t0,c0_status
ffffffff802d0004: 3c011000 lui
at,0x1000
ffffffff802d0008: 3421009f ori
at,at,0x9f
ffffffff802d000c: 01816025 or
t0,t0,at
ffffffff802d0010: 398c001f xori
t0,t0,0x1f
ffffffff802d0014: 408c6000 mtc0
t0,c0_status
ffffffff802d0018: 000000c0 sll
zero,zero,0x3
ffffffff802d001c: 37bd000f ori
sp,sp,0xf
ffffffff802d0020: 3bbd000f xori
sp,sp,0xf
ffffffff802d0024: 3c0c0000 lui t0,0x0
ffffffff802d0028: 3c010000 lui at,0x0
ffffffff802d002c: 658c0000 daddiu
t0,t0,0
ffffffff802d0030: 64210000 daddiu
at,at,0
ffffffff802d0034: 000c603c dsll32
t0,t0,0x0
ffffffff802d0038: 0181602d daddu
t0,t0,at
ffffffff802d003c: fd800000 sd
zero,0(t0)
ffffffff802d0040: 3c0d0000 lui t1,0x0
ffffffff802d0044: 3c010000 lui at,0x0
ffffffff802d0048: 65ad0000 daddiu
t1,t1,0
ffffffff802d004c: 6421fff8 daddiu
at,at,-8
ffffffff802d0050: 000d683c dsll32
t1,t1,0x0
ffffffff802d0054: 01a1682d daddu
t1,t1,at
ffffffff802d0058: 658c0008 daddiu
t0,t0,8
ffffffff802d005c: 158dfffe bne
t0,t1,ffffffff802d0058 <__init_begin+0x58>
ffffffff802d0060: fd800000 sd
zero,0(t0)
ffffffff802d0064: 3c1c0000 lui gp,0x0
ffffffff802d0068: 3c010000 lui at,0x0
A 32 bit kernel loads and boot with no problems on the
same board. The board design is based on Sentosa. The
boot loader is CFE. The kernel version is 2.4.28
Please advice.
Thank,
Michael
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