AX88796B驱动

chenxibing008

概述ASIX官方提供的驱动问题很大，在2.6.18上还勉强可以编译通过，能够进行网卡注册等操作，但是在2.6.28上连注册都无法成功，在register_netdev时候失败。
后来参考了ax88796.c等文件，进行了很多改动，目前已经能够编译通过，并且也已经可以进行NFS挂载了。
板子主文件在主板主文件中进行资源申请和注册。资源分配：static struct resource abing2440_ax88796b_resource[] = {        [0] = {                .start = S3C2410_CS5,                .end   = S3C2410_CS5 + 0x7FFF,                .flags = IORESOURCE_MEM        },        [1] = {                .start = IRQ_EINT0,                .end   = IRQ_EINT0,                //.flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,                .flags = IORESOURCE_IRQ,        }};
static struct platform_device abing2440_device_eth = {        .name           = "ax88796b",        .id             = -1,        .num_resources  = ARRAY_SIZE(abing2440_ax88796b_resource),        .resource       = abing2440_ax88796b_resource,        .dev            = {        },};
注册网卡设备。static struct platform_device *smdk2440_devices[] __initdata = {        &s3c_device_usb,        &s3c_device_lcd,        &s3c_device_wdt,        &s3c_device_i2c,        &s3c_device_iis,        &abing2440_device_eth,                   //注册网卡设备 };
驱动实现    驱动文件
    Makefileobj-y += ax88796b.o 8390.o
问题    目前一个最大的问题就是与USB冲突，出现DMA错误。如果在启动过程中插入了U盘之类的，NFS挂载就会出现问题，但是一旦进入Shell后，再次插入U盘，则不会出现这样的情况。
sd 0:0:0:0: [sda] Attached SCSI removable disksd 0:0:0:0: Attached scsi generic sg0 type 0eth0: DMAing conflict in ne_block_output.[DMAstat:1][irqlock:1]eth0: DMAing conflict in ne_block_output.[DMAstat:1][irqlock:1]eth0: DMAing conflict in ne_get_8390_hdr [DMAstat:1][irqlock:0].error occurred! Drop this packet!!eth0: DMAing conflict in ne_block_output.[DMAstat:1][irqlock:1]eth0: DMAing conflict in ne_block_output.[DMAstat:1][irqlock:1]eth0: DMAing conflict in ne_block_output.[DMAstat:1][irqlock:1]eth0: DMAing conflict in ne_get_8390_hdr [DMAstat:1][irqlock:0].error occurred! Drop this packet!!eth0: DMAing conflict in ne_block_output.[DMAstat:1][irqlock:1]eth0: DMAing conflict in ne_get_8390_hdr [DMAstat:1][irqlock:0].error occurred! Drop this packet!!eth0: DMAing conflict in ne_block_output.[DMAstat:1][irqlock:1]eth0: DMAing conflict in ne_get_8390_hdr [DMAstat:1][irqlock:0].error occurred! Drop this packet!!eth0: DMAing conflict in ne_get_8390_hdr [DMAstat:1][irqlock:0].error occurred! Drop this packet!!
drivers/net/ax88796b.c文件：
static void ax_block_output (struct net_device *dev, int count, const unsigned char *buf, const int start_page)^M{    struct ax_device *ax_local = (struct ax_device *) dev->priv;        void *ax_base = ax_local->membase;        unsigned long dma_start;
        /* This *shouldn't* happen. If it does, it's the last thing you'll see */        if (ax_local->dmaing)        {                PRINTK (ERROR_MSG, "%s: DMAing conflict in ne_block_output."                        "[DMAstat:%d][irqlock:%d]\n",                        dev->name, ax_local->dmaing, ax_local->irqlock);                return;        }
Starting the port mapper:kernel BUG at mm/slab.c:3000!Unable to handle kernel NULL pointer dereference at virtual address 00000000pgd = c3024000[00000000] *pgd=33b41031, *pte=00000000, *ppte=00000000Internal error: Oops: 817 [#1]Modules linked in:CPU: 0    Not tainted  (2.6.28 #281)PC is at __bug+0x20/0x2cLR is at release_console_sem+0x1a4/0x1e0pc : []    lr : []    psr: 60000093sp : c3be7e4c  ip : c3be7d8c  fp : c3be7e58r10: c380f500  r9 : 000080d0  r8 : 00000008r7 : 00000000  r6 : c3864980  r5 : c388a320  r4 : c3a90000r3 : 00000000  r2 : 60000093  r1 : 00002468  r0 : 00000021Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment userControl: c000717f  Table: 33024000  DAC: 00000015
重新配置了USB，去掉了USB Device文件系统等一些配置后OK了。
               
               
               
               

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u1/51797/showart_2070527.html

shuimu_1

楼主，你好，我最近在MPC8313B上面移植uboot下的AX88796B的网卡驱动，驱动程序是通过修改官方给的，适用于SMDK2440的源代码，现在总是出现接收到packet太长，打印结果如下：

=> ping 192.168.1.100
Using ax88796b device
Ping from NetOurIP 192.168.1.8; NetPingIP address is 192.168.1.100
ARP broadcast 1
nic_to_pc>>>>*((u16 *)&hdr + 0) = 0
nic_to_pc>>>>*((u16 *)&hdr + 1) = 14d
rxlen = 329,PKTSIZE_ALIGN+PKTALIGN = 1568
packet received
packet received
Receive from protocol 0x806
Got ARP
Got ARP REPLY, set server/gtwy eth addr (44:37:e6:01:5d:a
Got it
nic_to_pc>>>>*((u16 *)&hdr + 0) = 7474
nic_to_pc>>>>*((u16 *)&hdr + 1) = bdd4
rxlen = 48592,PKTSIZE_ALIGN+PKTALIGN = 1568
packet  too big!
Machine check in kernel mode.
Caused by (from msr): regs 07f38c48 Unknown values in msr
NIP: 07FC969C XER: 00000000 LR: 07FC963C REGS: 07f38c48 TRAP: 0200 DAR: 00000000
MSR: 0000b030 EE: 1 PR: 0 FP: 1 ME: 1 IR/DR: 11

GPR00: 0000DCE9 07F38D38 00000080 00000000 00000001 07F388E8 00000001 00001EB2
GPR08: 000000BD FA000100 00003D62 07FFC2A0 00000000 000080A0 07FFB000 09FBB000
GPR16: 00000000 00000000 00000000 00000000 00000000 FFFFFFFF 00000000 00000000
GPR24: 07F3B318 00000000 07F38FBC 00000074 0000BDD0 07F38F5C 07FFB6C0 07F3B2B0
Call backtrace:
07FC963C 07FC9AF4 07FC2F28 07FC1878 07FD2460 07FD98BC 07FD8F50
07FD90D8 07FCAA30 07FBFB20 07FBE66C
machine check
Resetting the board.

请问可能是什么原因呢？迫切需要您的帮助！谢谢