Re: Help on Modifying a Driver on Native Linux

Sent from my iPhone

> On 2 Apr 2025, at 00:36, Richard Akintola <[email protected]> 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.
> 
> Below are some of the drivers that one could modify on Linux native
> in order have the "I can modify Linux kernel\n" effect.
> 

Super. I will update the tutorial accordingly.

> 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.
>