I am booting linux on a custom board with an omapl138. I have 2 problems; One i have no UART output, 2 the kernel hangs in the boot process after "Freeing unused kernel memory". I was able to capture the kernel output at least using the log buffer, and because i had to copy and paste from memory dumps please excuse how jumbled it is.
I think i have no UART output because of the "serial8250.0 unable to register port at index 0 (IO0 MEM1c42000 IRQ25) line seen below. Any ideas how to fix? i Only want to register UART0, so for now im not worried that it happens on all 3 uarts and would prefer to register only 1 acutally.
I have no idea why the kernel hangs after freeing the memory, which mostly looks like __init code from looking at system.map file.
Log buffer from uboot memory dump after warm reset (tried to remove and space a little better for readability):
U-Boot 2012.04.01-svn1973 (Mar 02 2015 - 15:54:04)
DRAM: 64 MiB
WARNING: Caches not enabled
Using default environment
In: serial
Out: serial
Err: serial
Net: DaVinci-EMAC
Hit any key to stop autoboot: 0
U-Boot > md 0xc147dd48 0x1000
c147dd48: 00000000 00000000 00210038 c6000000 ........8.!.....
Booting Linux on physical CPU 0x0...............
Linux version 3.19.0-rc5-08930-g2d911e3-dirty (dan@DWAYER-UBUNTU) (gcc version 4.5.3 20110311 (prerelease) (GCC) )
#4 PREEMPT Tue Mar 313:55:18 CST 2015...............P.=.....
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f...........@.,.....
CPU: VIVT data cache, VIVT instruction cache............
(.......Machine: AMSC NGCC board........8.&.....
Memory policy: Data cache writethrough..........
@.).....
DaVincida850/amsc-ngcc/am18x variant 0x1...............0.......
On node0 totalpages: 12288.............X.B.....
free_area_init_node: node 0, pgdat c047bbe0, node_mem_map c2f99000..............8.$.....
DMA zone: 96 pages used for memmap............
0....... DMA zone: 0 pages reserved............
8.%..... DMA zone: 12288 pages,
LIFO batch:1...........@.-.....pcpu-alloc: s0 r0 d32768 u32768alloc=1*32768...
........(.......
pcpu-alloc: [0]0 ..............
`.J.....Built 1zonelists in Zone order, mobility grouping on.
Total pages: 12192..............
x.f.....Kernel command line: mem=48M@0xC1000000 console=ttyS0,115200n8 root=/dev/ram0 rw initrd=0xC1800000,4MB..
........H.3.....
PID hash table entries: 256 (order: -2, 1024 bytes).............
P.=.....Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)...........
P.<.....Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)....................
Memory:38780K/49152K available (3190K kernel code, 217K rwdata, 988K rodata, 164K init, 1198K bss, 10372K reserved, 0K cma-reserved)...................
Virtual kernel memory layout:
.vector : 0xffff0000 - 0xffff1000 ( 4 kB).
fixmap : 0xffc00000 - 0xfff00000 (3072 kB).
vmalloc :0xc3800000 - 0xff000000 ( 952MB).
lowmem: 0xc0000000 - 0xc3000000 ( 48 MB).
modules : 0xbf000000 - 0xc0000000 ( 16 MB).
.text : 0xc0008000 - 0xc041ce9c(4180 kB).
.init : 0xc041d000 - 0xc0446000 ( 164 kB).
.data : 0xc0446000 - 0xc047c6e0 ( 218 kB).
.bss : 0xc047c6e0 - 0xc05a800c (1199 kB).
........P.:.....
SLUB: HWalign=32, Order=0-3, Min Objects=0, CPUs=1, Nodes=1......
........@.,.....
Preemptible hierarchical RCU implementation.....
........ .......
NR_IRQS:245.....
........`.J.....
sched_clock: 32bits at 24MHz, resolution 41ns,wraps every 178956969942ns......
.u......8.".....
Console: colourdummy device 80x30..............
H.7.....Calibrating delay loop..
. 227.32 BogoMIPS (lpj=1136640).
..-.....8.$.....
pid_max: default: 32768 minimum: 301....:.3.....
P.;.....Mount-cache hash table entries: 1024 (order: 0, 4096 bytes).......4.....
P.@.....Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes).xP.....
8.'.....CPU: Testing write buffer coherency: ok.
.._.....P.:.....
Setting up static identity map for 0xc1324430 -0xc1324488......
........(.......
devtmpfs: initialized....@?.....
@.+.....pinctrlcore: initialized pinctrl subsystem.....A.......
8.".....NET: Registered protocol family 16......
........P.>.....
DMA: preallocated 256 KiB pool for atomic coherent allocations..
........0.......
cpuidle: using governor ladder..
........0.......
cpuidle: using governor menu....
.`......H.1....fdavinci_serial_init:85: failed to get UART0 clock........K......
H.1....fdavinci_serial_init:85:failed to get UART1 clock.......
........H.1....fdavinci_serial_init:85: failed to get UART2 clock.......4.......
..<.5...edma-dma-engine edma-dma-engine.0: TI EDMA DMA engine driverSUBSYSTEM=platform.DEVICE=+platform:edma-dma-engine.0.......
V.........<.5...
edma-dma-engine
edma-dma-engine.1: TI EDMA DMA engine driverSUBSYSTEM=platform.DEVICE=+platform:edma-dma-engine.
1.........2.....
0. .....Switched to clocksourcetimer0_1y.......
8.!.....NET: Registered protocol family 2.......
.`......P.?.....
TCP established hash table entries: 1024 (order: 0, 4096 bytes).
........H.8.....
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)........
H.8.....TCP: Hash tables configured (established 1024 bind 1024)W.......(.......
TCP: reno registered............
H.2.....UDP hash table entries:256 (order: 0, 4096 bytes)......
2.......H.7.....
UDP-Lite hash table entries: 256
(order: 0, 4096 bytes)._.......
8.!.....NET: Registered protocol family 1.......
&|......H.3.....
RPC: Registered named UNIX socket transport module..............
8.%.....RPC: Registered udp transport module....
.K......8.%.....
RPC: Registeredtcp transport module....U.......
P.9.....RPC: Registered tcp NFSv4.1 backchanneltransport module
................
@.-.....Trying to unpack rootfsimage as initramfs......."M.....
X.C.....rootfs image is not initramfs (no cpio magic); looks like an initrd.....
...#....H.2.....
Freeing initrd memory: 4096K (c0800000 - c0c00000)........N$....
H.5.....futex hash table entries: 256 (order: -1, 3072 bytes)...
...*....8.&.....
io scheduler noop registered (default)..vaLY....
H.8.....Serial:8250/16550 driver, 3 ports, IRQ sharing disabled
...Y......W.0..f
serial8250 serial8250.0: unable to register port at index 0 (IO0 MEM1c42000 IRQ25): -22SUBSYSTEM
=platform.DEVICE
=+platform:serial8250.0....Y....
..W.0..fserial8250 serial8250.1: unable to register port at index 0 (IO0 MEM1d0c000 IRQ53): -22SUBSYSTEM=platform.DEVICE=+platform:serial8250.1.
.s.Y......W.0..f
serial8250 serial8250.2: unable to register port at index 0 (IO0 MEM1d0d000 IRQ61): -22SUBSYSTEM
=platform.DEVICE
=+platform:serial8250.2...;Z....
(.......brd: module loaded......
...Z....(.......
i2c /dev entries driver.C..Z....
(.......TCP: cubic registered...
._.Z....8.".....
NET: Registered protocol family 17......I..[....
0.......console [netcon0] enabled.......Tn.[....
8.#.....netconsole: network logging started.....
+_.[....H.7....f
drivers/rtc/hcto
sys.c: unable to open rtc device
(rtc0)..G.[....
@.+....fWarning: unable to open an initial console.......d.[....
8.$.....RAMDISK: gzip image found at block 0....
..y.....H.2.....
VFS: Mounted root (ext2 filesystem) on device 1:
0.......El......
(.......devtmpfs: mounted.......
f.......H.8.....
Freeing unused kernel memory: 164K (c041d000 - c0446000)
c147f4a8: 00000000 00000000 00000000 00000000 ................
c147f4b8: 00000000 00000000 00000000 00000000 ................
c147f4c8: 00000000 00000000 00000000 00000000 ................
c147f4d8: 00000000 00000000 00000000 00000000 ................
c147f4e8: 00000000 00000000 00000000 00000000 ................
c147f4f8: 00000000 00000000 00000000 00000000 ................
c147f508: 00000000 00000000 00000000 00000000 ................
c147f518: 00000000 00000000 00000000 00000000 ................
c147f528: 00000000 00000000 00000000 00000000 ................
c147f538: 00000000 00000000 00000000 00000000 ................
c147f548: 00000000 00000000 00000000 00000000 ................
c147f558: 00000000 00000000 00000000 00000000 ................
c147f568: 00000000 00000000 00000000 00000000 ................