Re: Help on Modifying a Driver on Native Linux

On Tue, 1 Apr 2025, Richard Akintola wrote:

> I learnt that e1000 didn't work because the driver is included in VM
> images and not on Linux native, and a variant of e1000 on Linux native
> is the e1000e driver.

Thanks for the suggested text.  You can see it here:

https://kernelnewbies.org/FirstKernelPatch#DriverChange

julia


>
> Below are some of the drivers that one could modify on Linux native
> in order have the "I can modify Linux kernel\n" effect.
>
> Using the e1000e driver
>
> 1. vim drivers/net/ethernet/intel/e1000e/netdev.c
>
> 2. Find the probe function
>
> static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> {
>         struct net_device *netdev;
>         struct e1000_adapter *adapter;
>         struct e1000_hw *hw;
>         const struct e1000_info *ei = e1000_info_tbl[ent->driver_data];
>         resource_size_t mmio_start, mmio_len;
>         resource_size_t flash_start, flash_len;
>         static int cards_found;
>         u16 aspm_disable_flag = 0;
>         u16 eeprom_data = 0;
>         u16 eeprom_apme_mask = E1000_EEPROM_APME;
>         int bars, i, err;
>         s32 ret_val = 0;
>
>         printk(KERN_DEBUG "I can modify the Linux kernel\n");
>
> 3. Save the file and recompile the kernel, you should see the text
> printed when you run the "dmesg | less" command after rebooting.
>
> Or you could use the bluetooth driver
>
> 1. vim drivers/bluetooth/btusb.c
>
> 2. Find the probe function
>
> static int btusb_probe(struct usb_interface *intf,
>                        const struct usb_device_id *id)
> {
>         struct usb_endpoint_descriptor *ep_desc;
>         struct gpio_desc *reset_gpio;
>         struct btusb_data *data;
>         struct hci_dev *hdev;
>         unsigned ifnum_base;
>         int i, err, priv_size;
>
>         printk(KERN_DEBUG "I can modify the Linux Kernel\n");
>
>
> 3. Save the file and recompile the kernel, you should see the text
> printed when you run the "dmesg | less" command after rebooting.
>
> I hope this helps.
>
>