Hi, I'm trying to relocate the bootwrapper from the default address (0x400000) to a higher address (e.g. 0x800000) in order to support a larger than 4MB initramfs. However the kernel panic when trying to access the device tree blob which was relocated accordingly to a higher address. The kernel message from __log_buf is shown below.
The flat tree located at 0xbe4300 as the kerne message showed. Why cannot the kernel access this area? No TLB set for this area? <1>Unable to handle kernel paging request for data at address 0xc0be4308 <1>Faulting instruction address: 0xc01fdabc <4>Oops: Kernel access of bad area, sig: 11 [#1] <4> <4>NIP: c01fdabc LR: c01fdc38 CTR: 00000000 <4>REGS: c0383ee0 TRAP: 0300 Not tainted (2.6.33.5) <4>MSR: 00001032 <ME,IR,DR> CR: 28558922 XER: 00000504 <4>DAR: c0be4308, DSISR: c0000000 <4>TASK = c0375328[0] 'swapper' THREAD: c0382000 <4>GPR00: c01fdc38 c0383f90 c0375328 c01fd4c8 00000000 00000000 00be4300 00000010 <4>GPR08: c01dbd94 c0be4300 04000000 00000000 00000000 00000000 07fff000 00000001 <4>GPR16: 007fff0d 00800554 00000001 007fff00 07ff9d78 ffffffff 00000000 07d5d2a0 <4>GPR24: 00000891 00000000 c0390000 c01fd4c8 00000000 00be4300 00000000 00be4300 <4>NIP [c01fdabc] of_scan_flat_dt+0x20/0x174 <4>LR [c01fdc38] early_init_devtree+0x28/0x288 <4>Call Trace: <4>[c0383fb0] [c01fdc38] early_init_devtree+0x28/0x288 <4>[c0383fd0] [c01fe9c0] machine_init+0x20/0x5c <4>[c0383ff0] [c0002244] start_here+0x48/0xc4 <4>Instruction dump: <4>7fe5fb78 4bfff899 90610008 4bfffeb4 9421ffe0 7c0802a6 bf410008 90010024 <4>7c7b1b78 7c9c2378 3f40c039 813a9070 <80090008> 7fe90214 38600000 3ba0ffff <4>---[ end trace 31fd0ba7d8756001 ]--- <0>Kernel panic - not syncing: Attempted to kill the idle task! <4>Call Trace: <4>[c0383dd0] [c0006c90] show_stack+0x40/0x168 (unreliable) <4>[c0383e10] [c001cbfc] panic+0x8c/0x178 <4>[c0383e60] [c00209b0] do_exit+0x5c4/0x5d0 <4>[c0383ea0] [c000bb08] kernel_bad_stack+0x0/0x4c <4>[c0383ec0] [c000ede8] bad_page_fault+0x90/0xd8 <4>[c0383ea0] [c000bb08] kernel_bad_stack+0x0/0x4c <4>[c0383ec0] [c000ede8] bad_page_fault+0x90/0xd8 <4>[c0383ed0] [c000e2b8] handle_page_fault+0x7c/0x80 <4>[c0383f90] [00000000] (null) <4>[c0383fb0] [c01fdc38] early_init_devtree+0x28/0x288 <4>[c0383fd0] [c01fe9c0] machine_init+0x20/0x5c <4>[c0383ff0] [c0002244] start_here+0x48/0xc4 The kernel message from uboot and the bootwrapper is shown below. => bootm 5000000 ## Booting image at 05000000 ... Image Name: Linux-2.6.33.5 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 1757351 Bytes = 1.7 MB Load Address: 00800000 Entry Point: 00800554 Verifying Checksum ... OK Uncompressing Kernel Image ... OK Memory <- <0x0 0x8000000> (128MB) ENET0: local-mac-address <- 00:09:9b:01:58:64 CPU clock-frequency <- 0x7270e00 (120MHz) CPU timebase-frequency <- 0x7270e0 (8MHz) CPU bus-frequency <- 0x3938700 (60MHz) zImage starting: loaded at 0x00800000 (sp: 0x07d1cbd0) Allocating 0x3a15a4 bytes for kernel ... gunzipping (0x00000000 <- 0x0080c000:0x00bd702c)...done 0x3886ec bytes Linux/PowerPC load: root=/dev/ram Finalizing device tree... flat tree at 0xbe4300 Thanks, -Shawn. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
