Hi,
We have a custom Davinci 6446 board on which an external UART controller TL16C2752 is interfaced (memory mapped) to the SOC using the EMIF interface.
In the platform file ./arch/arm/mach-davinci/board-evm.c we have added the below serial resource information:
static struct plat_serial8250_port serial_platform_data[2] = {
{
// Internal On-chip UART.
.membase = (char *)IO_ADDRESS(DAVINCI_UART0_BASE),
.mapbase = (unsigned long)DAVINCI_UART0_BASE,
.irq = IRQ_UARTINT0,
.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
.iotype = UPIO_MEM32,
.regshift = 2,
.uartclk = DAVINCI_UART_CLK,
},
{
#define DAVINCI_UART0_EXTERNAL_BASE 0x08000000
// external tl16c2752 uart controller.
.membase = (char *)IO_ADDRESS(DAVINCI_UART0_EXTERNAL_BASE),
.mapbase = (unsigned long)DAVINCI_UART0_EXTERNAL_BASE,
.irq = IRQ_GPIO6,
.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
.iotype = UPIO_MEM,
.regshift = 0,
.uartclk = 8000000,
},
};
With this configuration I build the kernel image and when I boot the kernel panics for with error message
"Unable to handle kernel paging request at virtual address e7400001"
Below is the kernel boot log dump:-
#########################################################################################################
## Booting image at 80700000 ...
Image Name: Linux-2.6.10_mvl401-davinci_evm-
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1514668 Bytes = 1.4 MB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
OK
Starting kernel ...
Linux version 2.6.10_mvl401-davinci_evm-PSP_01_30_00_082 (siva@a2md05879.mindtree.com) (gcc version 3.4.3 (MontaVista 3.4.3-25.0.104.0600975 2006-07-06)) #443 Mon Jul 26 11:57:53 IST 2010
CPU: ARM926EJ-Sid(wb) [41069265] revision 5 (ARMv5TEJ)
CPU0: D VIVT write-back cache
CPU0: I cache: 16384 bytes, associativity 4, 32 byte lines, 128 sets
CPU0: D cache: 8192 bytes, associativity 4, 32 byte lines, 64 sets
Machine: DaVinci Telemedicine
Memory policy: ECC disabled, Data cache writeback
DM6443a
PIN MUX1 value is 81
configured UART controller
Built 1 zonelists
Kernel command line: console=ttyS0,115200n8 noinitrd rw root=/dev/mmcblk0p1 rootfstype=ext3,nolock mem=120M ip=off video=davincifb:osd0=720x480x16,1350K:osd1=720x480,1350K:vid0=720x480,2025K:vid1=720x480,2025K davinci_enc_mngr.ch0_output=LCD1 davinci_enc_mngr.ch0_mode=800x480
PID hash table entries: 512 (order: 9, 8192 bytes)
Console: colour dummy device 80x30
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 120MB = 120MB total
Memory: 118144KB available (2589K code, 535K data, 292K init)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU: Testing write buffer coherency: ok
spawn_desched_task(00000000)
desched cpu_callback 3/00000000
ksoftirqd started up.
desched cpu_callback 2/00000000
desched thread 0 started up.
NET: Registered protocol family 16
DaVinci: 71 gpio irqs
Registering platform device 'serial8250.0'. Parent at platform
Registering platform device 'musb_hdrc'. Parent at platform
Registering platform device 'mmc.0'. Parent at platform
DaVinci I2C DEBUG: 17:04:58 Jul 22 2010
Registering platform device 'i2c'. Parent at platform
ch0 default output "LCD1", mode "800x480"
MUX: initialized LOEEN
VPBE Encoder Initialized
attaching client with addr 38
i2c_adapter i2c-0: TLM-T700 encoder initialized
read val FF
MUX: initialized RGB666
TLM-TL700 encoder initialized
SCSI subsystem initialized
usbcore: registered new driver usbfs
usbcore: registered new driver hub
musb_hdrc: version 2.2a/db-0.4.8 [cppi-dma] [host] [debug=0]
musb_hdrc: ConfigData=0x06 (UTMI-8, dyn FIFOs, SoftConn)
musb_hdrc: MHDRC RTL version 1.300
musb_hdrc: USB Host mode controller at c8002000 using DMA, IRQ 12
musb_hdrc musb_hdrc: new USB bus registered, assigned bus number 1
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
MUX: initialized MCBSP0
MUX: initialized UART1
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
Registering platform device 'davincifb.0'. Parent at platform
Console: switching to colour frame buffer device 90x30
davincifb davincifb.0: dm_osd0_fb: 720x480x16@0,0 with framebuffer size 1350KB
davincifb davincifb.0: dm_vid0_fb: 720x480x16@0,0 with framebuffer size 2025KB
davincifb davincifb.0: dm_osd1_fb: 720x480x4@0,0 with framebuffer size 1350KB
davincifb davincifb.0: dm_vid1_fb: 720x480x16@0,0 with framebuffer size 2025KB
usb 1-1: new high speed USB device using musb_hdrc and address 2
hub 1-1:1.0: USB hub found
hub 1-1:1.0: 4 ports detected
watchdog: TI DaVinci Watchdog Timer: timer margin 64 sec
Registering platform device 'davinci_resizer.2'. Parent at platform
Registering platform device 'davinci_telemedicin'. Parent at platform
Davinci Telemed LED device initilized successfully
Telemed RTC Init
Registering platform device 'davinci_previewer.2'. Parent at platform
Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
Registering platform device 'serial8250'. Parent at platform
ttyS0 at MMIO 0x1c20000 (irq = 40) is a 16550A
Unable to handle kernel paging request at virtual address e7400001
pgd = c0004000
[e7400001] *pgd=00000000
Internal error: Oops: 5 [#1]
Modules linked in:
CPU: 0
PC is at serial_in+0x68/0x84
LR is at serial8250_config_port+0xbc/0xb7c
pc : [<c017b948>] lr : [<c017d3b0>] Not tainted
sp : c04afdd8 ip : 00000002 fp : c04afde4
r10: c04ae000 r9 : c02dea18 r8 : 00000000
r7 : c0356034 r6 : c0356034 r5 : c0602f48 r4 : 00000000
r3 : e7400000 r2 : 20000013 r1 : 00000001 r0 : c0356034
Flags: nZCv IRQs off FIQs on Mode SVC_32 Segment kernel
Control: 5317F Table: 80004000 DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc04ae1a0)
Stack: (0xc04afdd8 to 0xc04b0000)
fdc0: c04afe2c c04afde8
fde0: c017d3b0 c017b8f0 c02eeb2c 20000013 c04afe14 c04afe00 fffffffe 00000001
fe00: c71d6d54 c02ee8b8 c0602f48 c0356034 c0602f48 00000000 c02dea18 c0356034
fe20: c04afe4c c04afe30 c017af98 c017d304 c0356034 c0602f48 c02ee8b8 c02ee7b0
fe40: c04afe74 c04afe50 c017b424 c017af3c c017b528 007a1200 00000000 00000000
fe60: 00000002 08000000 c04afeac c04afe78 c017e4f4 c017b380 c00784b0 c04afeb4
fe80: 00000000 c02deae4 c02dea18 c04afeb8 c02ee930 00000000 00000000 00000000
fea0: c04aff54 c04afeb0 c017e5f4 c017e434 00000000 00000000 00000000 e7400000
fec0: 00000036 007a1200 02000000 00000000 00000000 00000000 00000000 00000000
fee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
ff00: 00000000 00000000 00000000 10000040 00000000 00000000 00000000 00000000
ff20: 00000000 00000000 08000000 c02dea18 00000000 c02eec10 c04aff54 c02ee930
ff40: c02dea18 c02eecb8 c04aff6c c04aff58 c017fb20 c017e55c c02dea20 c02ee930
ff60: c04aff8c c04aff70 c017fc3c c017fadc c01404dc c02eec5c ffffffff c02eec10
ff80: c04affb4 c04aff90 c017ff48 c017fbf4 c03560f0 ffffffff c715a3a8 c03560f0
ffa0: 00000000 00000000 c04affd4 c04affb8 c0022d20 c017fed4 c002b84c c04ae000
ffc0: 00000000 c002b91c c04afff4 c04affd8 c0051298 c0022c84 00000000 00000000
ffe0: 00000000 00000000 00000000 c04afff8 c00692a0 c0051214 3d0665f6 f6662f64
Backtrace:
[<c017b8e0>] (serial_in+0x0/0x84) from [<c017d3b0>] (serial8250_config_port+0xbc/0xb7c)
[<c017d2f4>] (serial8250_config_port+0x0/0xb7c) from [<c017af98>] (uart_configure_port+0x6c/0x198)
[<c017af2c>] (uart_configure_port+0x0/0x198) from [<c017b424>] (uart_add_one_port+0xb4/0x11c)
r7 = C02EE7B0 r6 = C02EE8B8 r5 = C0602F48 r4 = C0356034
[<c017b370>] (uart_add_one_port+0x0/0x11c) from [<c017e4f4>] (uart_8250_register_port+0xd0/0x128)
r8 = 08000000 r7 = 00000002 r6 = 00000000 r5 = 00000000
r4 = 007A1200
[<c017e424>] (uart_8250_register_port+0x0/0x128) from [<c017e5f4>] (serial8250_probe+0xa8/0xcc)
[<c017e54c>] (serial8250_probe+0x0/0xcc) from [<c017fb20>] (driver_probe_device+0x54/0x74)
r6 = C02EECB8 r5 = C02DEA18 r4 = C02EE930
[<c017facc>] (driver_probe_device+0x0/0x74) from [<c017fc3c>] (driver_attach+0x58/0x94)
r5 = C02EE930 r4 = C02DEA20
[<c017fbe4>] (driver_attach+0x0/0x94) from [<c017ff48>] (bus_add_driver+0x84/0x12c)
r6 = C02EEC10 r5 = FFFFFFFF r4 = C02EEC5C
[<c017fec4>] (bus_add_driver+0x0/0x12c) from [<c0022d20>] (serial8250_init+0xac/0xf4)
[<c0022c74>] (serial8250_init+0x0/0xf4) from [<c0051298>] (init+0x94/0x1e0)
r7 = C002B91C r6 = 00000000 r5 = C04AE000 r4 = C002B84C
[<c0051204>] (init+0x0/0x1e0) from [<c00692a0>] (do_exit+0x0/0xda0)
r7 = 00000000 r6 = 00000000 r5 = 00000000 r4 = 00000000
Code: e5903000 e5d33001 ea000001 e5903004 (e7d33001)
<0>Kernel panic - not syncing: Attempted to kill init!
#########################################################################################################
Please let me know if I am doing some thing wrong with configuration.
Regards,
Hemanth.V
