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【WRTnode2R试用体验】+UBoot 中实现USB功能

枫凌94

2015-11-7 18:28:22 3274 开关

0 ralink的SDK提供的uboot是支持u*相关命令的，只需要在config.mk打开相应的开关即可。一开始以为只需要这样做： RALINK_USB = ON RALINK_EHCI = ON RALINK_OHCI = ON 编译烧写后，发现u相关命令已经出现在uboot中了，但是每次u reset，都扫描不到storage存储设备。 MT7620 # ureset (Re)start USB... USB: scanning bus for devices... ## RH_GET_DESCRIPTOR ##RH_SET_ADDRESS ##RH_GET_DESCRIPTOR ##RH_GET_DESCRIPTOR ##RH_GET_DESCRIPTOR ##RH_SET_CONFIGURA tiON ##RH_GET_DESCRIPTOR ## RH_GET_DESCRIPTOR ##RH_GET_DESCRIPTOR \| RH_CLASS ##RH_GET_DESCRIPTOR \| RH_CLASS ## RH_GET_STATUS\| RH_CLASS 1 USB Device(s)found scanning bus for storage devices... 0 Storage Device(s) found u info中，product和vendor id均为0，太怪异了！ MT7620 # uinfo 1: Hub, USB Revision 1.10 - OHCIRoot Hub - Class: Hub - PacketSize: 8 Configurations: 1 - Vendor: 0x0000 Product 0x0000 Version 0.0 Configuration: 1 - Interfaces: 1 Self Powered 0mA Interface: 0 - Alternate Settings 0, Endpoints: 1 - Class Hub - Endpoint 1 In Interrupt MaxPacket 2 Interval 255ms 并且发现uboot识别的u host只有12M/s的速度 MT7620 # utree Device Tree: 1 Hub(12 Mb/s, 0mA) OHCI Root Hub 按理说，MT7620的u应该是2.0的高速设备，不可能是12M/s的。仔细分析了一下代码，发现只要开启了RALINK_OHCI，RALINK_EHCI就会失效。so，只打开EHCI，关闭OHCI。 RALINK_USB = ON RALINK_EHCI = ON RALINK_OHCI =OFF 编译烧录，发现问题更离奇： U-Boot 1.1.3(Jun 9 2014 - 17:38:01) MT7620 # ureset (Re)start USB... USB: in u_lowlevel_init Error, couldn't init Lowlevel part 看来调用u_lowlevel_init失败！为了分析问题，在u_lowlevel_init的代码中加入一些printf信息，：发现，u_lowlevel_init返回-1，于是发现u*_lowlevel_init调用了如下代码：位于ehci-ra.c中 int ehci_hcd_init(void) { #if defined(RT3352_ASIC_BOARD) \|\| defined(RT3883_ASIC_BOARD)\|\| defined(RT5350_ASIC_BOARD) leave_power_saving(); mdelay(100); rt_set_host(); mdelay(100); hccr = (struct ehci_hccr )(0xb01c0000); hcor = (struct ehci_hcor )((uint32_t) hccr +HC_LENGTH(ehci_readl(&hccr->cr_capbase))); printf("Mediatek/Ralink USB EHCI host inithccr %x and hcor %x hc_length %dn", (uint32_t)hccr, (uint32_t)hcor,(uint32_t)HC_LENGTH(ehci_readl(&hccr->cr_capbase))); return 0; #else return -1; #endif } 不知道问题在哪，直接屏蔽掉主控的控制，终于有东西了 MT7620 # ureset (Re)start USB... USB: in u_lowlevel_init Mediatek/RalinkUSB EHCI host init hccr b01c0000 and hcor b01c0010 hc_length 16 Register 1111NbrPorts 1 USB EHCI 1.00 scanning bus for devices... 2 USB Device(s) found scanning bus for storage devices... 1 Storage Device(s) found MT7620 # uinfo 1: Hub, USB Revision 0.2 - u-boot EHCI Host Controller - Class: Hub - PacketSize: 64 Configurations: 1 - Vendor: 0x0000 Product 0x0000 Version 0.1 Configuration: 1 - Interfaces: 1 Self Powered 0mA Interface: 0 - Alternate Settings 0, Endpoints: 1 - Class Hub - Endpoint 1 In Interrupt MaxPacket 8 Interval 0ms 2: MassStorage, USB Revision 2.0 - HP USB 2.0 Flash 00CCCBB99999 - Class: (from Interface) Mass Storage - PacketSize: 64 Configurations: 1 - Vendor: 0x0204 Product 0x6025 Version 1.0 Configuration: 1 - Interfaces: 1 Bus Powered 100mA Interface: 0 - Alternate Settings 0, Endpoints: 2 - Class Mass Storage, Transp. SCSI, Bulk only - Endpoint 1 Out Bulk MaxPacket 512 - Endpoint 1 In Bulk MaxPacket 512 速度也正确了！ MT7620 # u*tree Device Tree: 1 Hub(480 Mb/s, 0mA) \| u-boot EHCI Host Controller \| +-2 Mass Storage (480 Mb/s, 100mA) HP USB 2.0 Flash 00CCCBB99999 在ehci-ra.c的ehci_hcd_init中加入MT7620_ASIC_BOARD定义。 0
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