转载修改 Linux 内核 DM9000 支持 tiny210 开发板

浏览数：22 / 时间：2015年06月20日

错误现象：

dm9000 dm9000: read wrong id 0x2b2a2928
dm9000 dm9000: wrong id: 0x2b2a2928
dm9000 dm9000: not found (-19).

TCP cubic registered
NET: Registered protocol family 17
Registering the dns_resolver key type
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 2
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

配置内核支持NFS + DM9000 ,部分引用网络文章：

(1) 配置网络支持
[*] Networking support  --->
    Networking options  --->
        <*> Packet socket
        <*> Unix domain sockets
        [*] TCP/IP networking
        [*]   IP: multicasting
        [*]   IP: kernel level autoconfiguration
        [*]     IP: DHCP support
        [*]     IP: BOOTP support
        [*]     IP: RARP support
        [*]   IP: multicast routing

(2) 配置网卡设备支持
Device Drivers  --->
    [*] Network device support  --->
        [*]   Ethernet driver support  --->
            <*>   DM9000 support

(3) 配置网络文件系统支持
File systems  --->
    [*] Network File Systems  --->
        <*>   NFS client support
        <*>     NFS client support for NFS version 2
        <*>     NFS client support for NFS version 3
        [*]       NFS client support for the NFSv3 ACL protocol extension
        <*>     NFS client support for NFS version 4
        [*]   Root file system on NFS

再配置NFS ，ubuntu下配置NFS服务器很简单
sudo apt-get install nfs-kernel-server

然后以根权限打开/etc/exports文件，我的NFS根目录为/nfsroot，一般情况使用版本2，3，故设置export为
/nfsroot/   *(rw,sync,no_subtree_check)
共享的目录名    所有IP(各种属性)
属性中 no_subtree_check 最好是带上，我本来不太清楚，使用了no_root_squash，结果会导致 mount.nfs:access denied by server while mounting等错误
最后，还要修改下/nfsroot的权限，为了以后使用方便。
chmod 755 /nfsroot

再附带几个用到的命令:
重启NFS服务:    sudo /etc/init.d/nfs-kernel-server restart
如果提示 Cannot register service: RPC: Unable to receive; errno = Connection refused
需要先安装 portmap ，再启动之 sudo /etc/init.d/portmap start

接下来是修改内核，支持DM9000网卡

//arch/arm/mach-s5pv210/mach-smdkv210.c

#define S5PV210_PA_DM9000_A     (0x88001000)
#define S5PV210_PA_DM9000_F     (S5PV210_PA_DM9000_A + 0x300C)
//
static struct resource smdkv210_dm9000_resources[] = {
    [0] = {
        .start  = S5PV210_PA_DM9000_A, //地址线
        .end    = S5PV210_PA_DM9000_A + SZ_1K*4 - 1,
        .flags  = IORESOURCE_MEM,
    },
    [1] = {
        .start  = S5PV210_PA_DM9000_F, //数据线
        .end    = S5PV210_PA_DM9000_F + SZ_1K*4 - 1,
        .flags  = IORESOURCE_MEM,
    },
    [2] = {
        .start  = IRQ_EINT(7),
        .end    = IRQ_EINT(7),
        .flags  = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHLEVEL,//中断资源和高频存储发资源
    },
};

static struct dm9000_plat_data smdkv210_dm9000_platdata = {
    .flags = DM9000_PLATF_16BITONLY | DM9000_PLATF_NO_EEPROM, //16bit模式
    .dev_addr = { 0x08, 0x90, 0x00, 0xa0, 0x02, 0x10 }, //设置网卡的物理地址
};

static void __init smdkv210_dm9000_init(void)
{
    unsigned int tmp;

    gpio_request(S5PV210_MP01(1), "nCS1");
    s3c_gpio_cfgpin(S5PV210_MP01(1), S3C_GPIO_SFN(2));
    gpio_free(S5PV210_MP01(1));

    tmp = (5 << S5P_SROM_BCX__TACC__SHIFT);
    __raw_writel(tmp, S5P_SROM_BC1);

    tmp = __raw_readl(S5P_SROM_BW);
    tmp &= (S5P_SROM_BW__CS_MASK << S5P_SROM_BW__NCS1__SHIFT);
    tmp |= (1 << S5P_SROM_BW__NCS1__SHIFT);
    __raw_writel(tmp, S5P_SROM_BW);
}

完成，重新编译内核

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