i.MX6 Dual6Quad,sabre-sd，如何打开PCIe EndPoint Mode

lstyle

使用的板子是i.MX6 Dual6Quad，现在想把这个板子当成一个PCIE设备，在i.MX 6Dual/6Quad Linux Reference Manual和i.MX 6Dual/6Quad Applications Processor Reference Manual中都有提到这个板子支持PCIe EndPoint mode ，但是具体怎么能启动这个模式呢？

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小智MM

楼主你好，请问你这里使用的是官网提供的开发板么？

lstyle

小智MM 发表于 2016-3-23 15:22
楼主你好，请问你这里使用的是官网提供的开发板么？

是照着原版开发版设计的，就是通过板子上的PCIE连了一个i7的处理器模块。我在kernel configure里面选中了PCI Express EP mode in the IMX6 RC/EP interconnection system，但是启动之后，在i7模块那边进DOS下看PCI设备，没有IMX6这个设备啊，没有VendorID,DeviceID是ABCD_16C3h的设备啊。

lstyle

小智MM 发表于 2016-3-23 15:22
楼主你好，请问你这里使用的是官网提供的开发板么？

在menuconfig中选择了PCIE EP MODE后，IMX6的启动信息如下：
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...

我查了下源码，是一直在等待一个信号：
                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");

请问这个pci寄存器空间的说明文档在哪有啊？