Hello everyone.
I get a problem about the PCIe EP mode.
I use a i.MX6 Dual6Quad board and i want set it as a PCIE endpoint device.
I select PCI Express support and PCI Express EP mode in the IMX6 RC/EP interconnection systeｍ.
But I get a boot problem like this:
U-Boot 2009.08 (10月 08 2015 - 16:22:43)
CPU: Freescale i.MX6 family TO1.2 at 792 MHz
Thermal sensor with ratio = 181
Temperature: 27 C, calibration data 0x57b4c57d
mx6q pll1: 792MHz
mx6q pll2: 528MHz
mx6q pll3: 480MHz
mx6q pll8: 50MHz
ipg clock : 66000000Hz
ipg per clock : 66000000Hz
uart clock : 80000000Hz
cspi clock : 60000000Hz
ahb clock : 132000000Hz
axi clock : 264000000Hz
emi_slow clock: 132000000Hz
ddr clock : 528000000Hz
usdhc1 clock : 198000000Hz
usdhc2 clock : 198000000Hz
usdhc3 clock : 198000000Hz
usdhc4 clock : 198000000Hz
nfc clock : 24000000Hz
Board: i.MX6Q-SABRESD: unknown-board Board: 0x63012 [POR ]
Boot Device: SPI NOR
I2C: ready
DRAM: 2 GB
MMC: FSL_USDHC: 0,FSL_USDHC: 1,FSL_USDHC: 2
JEDEC ID: 0x20:0x20:0x16
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: got MAC address from IIM: 00:00:00:00:00:00
FEC0 [PRIME]
Hit any key to stop autoboot: 0
mmc2(part 0) is current device
MMC read: dev # 2, block # 2048, count 8192 ... 8192 blocks read: OK
## Booting kernel from Legacy Image at 10800000 ...
Image Name: Linux-3.0.35-2666-gbdde708
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3939476 Bytes = 3.8 MB
Load Address: 10008000
Entry Point: 10008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Linux version 3.0.35-2666-gbdde708 (xexerse@ubuntu) (gcc version 4.6.2 20110630 (prerelease) (Freescale MAD -- Linaro 2011.07 -- Built at 2011/08/10 09:20) ) #3 SMP PREEMPT Thu Mar 24 09:39:43 CST 2016
CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d
CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: Freescale i.MX 6Quad/DualLite/Solo Sabre-SD Board
Ignoring unrecognised tag 0x54410008
Memory policy: ECC disabled, Data cache writealloc
CPU identified as i.MX6Q, silicon rev 1.2
PERCPU: Embedded 7 pages/cpu @8c80e000 s5440 r8192 d15040 u32768
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 454656
Kernel command line: console=ttymxc0,115200 console=ttymxc0,115200 console=ttymxc0,115200 video=mxcfb0:dev=ldb,LDB-XGA,if=RGB666 ldb=sep1 video=mxcfb1:dev=lcd,ZXSM-VGA,if=RGB24 root=/dev/mmcblk0p1 rootwait
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 262144 (order: 8, 1048576 bytes)
Inode-cache hash table entries: 131072 (order: 7, 524288 bytes)
Memory: 512MB 1280MB = 1792MB total
Memory: 1805200k/1805200k available, 291952k reserved, 360448K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xf4600000 - 0xffe00000 ( 184 MB)
vmalloc : 0xea800000 - 0xf2000000 ( 120 MB)
lowmem : 0x80000000 - 0xea000000 (1696 MB)
pkmap : 0x7fe00000 - 0x80000000 ( 2 MB)
modules : 0x7f000000 - 0x7fe00000 ( 14 MB)
.init : 0x80008000 - 0x8003d000 ( 212 kB)
.text : 0x8003d000 - 0x80ab5728 (10722 kB)
.data : 0x80ab6000 - 0x80b19f80 ( 400 kB)
.bss : 0x80b19fa4 - 0x80b6840c ( 314 kB)
SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Preemptible hierarchical RCU implementation.
NR_IRQS:624
MXC GPIO hardware
sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655ms
arm_max_freq=1GHz
MXC_Early serial console at MMIO 0x2020000 (options '115200')
bootconsole [ttymxc0] enabled
Console: colour dummy device 80x30
Calibrating delay loop... 1581.05 BogoMIPS (lpj=7905280)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available
CPU1: Booted secondary processor
CPU2: Booted secondary processor
CPU3: Booted secondary processor
Brought up 4 CPUs
SMP: Total of 4 processors activated (6324.22 BogoMIPS).
print_constraints: dummy:
NET: Registered protocol family 16
print_constraints: vddpu: 725 <--> 1300 mV at 700 mV fast normal
print_constraints: vddcore: 725 <--> 1300 mV at 1150 mV fast normal
print_constraints: vddsoc: 725 <--> 1300 mV at 1200 mV fast normal
print_constraints: vdd2p5: 2000 <--> 2775 mV at 2400 mV fast normal
print_constraints: vdd1p1: 800 <--> 1400 mV at 1100 mV fast normal
print_constraints: vdd3p0: 2625 <--> 3400 mV at 3000 mV fast normal
vmap allocation for size 134221824 failed: use vmalloc=<size> to increase size.
hw-breakpoint: found 6 breakpoint and 1 watchpoint registers.
hw-breakpoint: 1 breakpoint(s) reserved for watchpoint single-step.
hw-breakpoint: maximum watchpoint size is 4 bytes.
L310 cache controller enabled
l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x02070000, Cache size: 1048576 B
bio: create slab <bio-0> at 0
mxs-dma mxs-dma-apbh: initialized
print_constraints: SPKVDD: 4200 mV
print_constraints: 1_8V: 1800 mV
print_constraints: MICVDD: 3300 mV
print_constraints: vmmc: 3300 mV
vgaarb: loaded
SCSI subsystem initialized
spi_imx imx6q-ecspi.0: probed
spi_imx imx6q-ecspi.1: probed
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Freescale USB OTG Driver loaded, $Revision: 1.55 $
imx-ipuv3 imx-ipuv3.0: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)
imx-ipuv3 imx-ipuv3.1: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)
mxc_mipi_csi2 mxc_mipi_csi2: i.MX MIPI CSI2 driver probed
mxc_mipi_csi2 mxc_mipi_csi2: i.MX MIPI CSI2 dphy version is 0x3130302a
MIPI CSI2 driver module loaded
Advanced Linux Sound Architecture Driver Version 1.0.24.
Bluetooth: Core ver 2.16
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO socket layer initialized
cfg80211: Calling CRDA to update world regulatory domain
max17135 2-0048: PMIC MAX17135 for eInk display
i2c-core: driver [max17135] using legacy suspend method
i2c-core: driver [max17135] using legacy resume method
Switching to clocksource mxc_timer1
NET: Registered protocol family 2
IP route cache hash table entries: 65536 (order: 6, 262144 bytes)
TCP established hash table entries: 262144 (order: 9, 2097152 bytes)
TCP bind hash table entries: 65536 (order: 7, 786432 bytes)
TCP: Hash tables configured (established 262144 bind 65536)
TCP reno registered
UDP hash table entries: 1024 (order: 3, 32768 bytes)
UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
PMU: registered new PMU device of type 0
Static Power Management for Freescale i.MX6
wait mode is enabled for i.MX6
cpaddr = ea880000 suspend_iram_base=ea8f4000
PM driver module loaded
iMX6 PCIe PCIe EP mode imx_pcie_pltfm_probe entering.
PCIE: imx_pcie_pltfm_probe start link up.
PCIe EP: waiting for link up...
Here is the source code in kernel:
pr_info("PCIe EP: waiting for link up...\n");
/* link is debug bit 36 debug 1 start in bit 32 */
do {
usleep_range(10, 20);
} while ((readl(dbi_base + DB_R1) & 0x10) == 0);
/* Make sure that the PCIe link is up */
if (imx_pcie_link_up(dbi_base)) {
pr_info("PCIe EP: link up.\n");
} else {
pr_info("PCIe EP: ERROR link is down, exit!\n");
where can i get the definition of the pci registers?
In "i.MX 6Dual/6Quad Applications Processor Reference Manual" ，i only find the PCIe CTRL EP Mode Memory Map/Register Definition .
Can anybody help me? I'm new about this.
Thank you very much.
I study the Manual,and I have new questions.
The hardware schematic diagram is shown as:
I select PCI Express support and PCI Express RC mode in the IMX6 RC/EP interconnection systeｍ, and the boot log is like this:
iMX6 PCIe PCIe RC mode imx_pcie_pltfm_probe entering.
PCIE: imx_pcie_pltfm_probe start link up.
link up failed, DB_R0:0x00cb4200, DB_R1:0x08200000!
IMX PCIe port: link down!
I select PCI Express support and PCI Express EP mode in the IMX6 RC/EP interconnection systeｍ, and DBR1 is always 0x08200000.
If I do not link any device in IMX6 PCIE side, does it always link down?
And is there any possible reason why DBR1 always being 0x08200000?
