Hi,
I am having a hard time understanding the nature of the "echo cape-bone-iio
> /sys/devices/bone_capemgr.*/slots"
I have written the following program in Go:
package bbbdevtreeovly
import (
// "io"
// "bytes"
// "fmt"
"io/ioutil"
"log"
"os"
// "os/exec"
// "strings"
"path/filepath"
)
const (
slotsDir string = `/sys/devices/` // Find BBB's slots
)
func Load_dto(dtoFileName string, dtoFilePath string) (err error) {
log.SetPrefix(`BBB Device Tree Overlay: `)
slotFiles := make([]os.FileInfo, 100)
slotFiles, err = ioutil.ReadDir(slotsDir)
var i int
for i = 0; i < len(slotFiles); i++ {
found, _ := filepath.Match(`bone_capemgr.*`, slotFiles[i].Name())
if found {
break
}
}
log.Println("This is the new program...", "\n")
slotsLoc := filepath.Join(slotsDir, slotFiles[i].Name(), `slots`)
log.Println("DTO File: ", dtoFileName, "\n")
slots, err := os.Open(slotsLoc)
if err != nil {
log.Println(err)
return err
}
defer slots.Close()
log.Println("Slots location: ", slots.Name(), "\n")
slots.Write([]byte(dtoFileName))
// slots.Write([]byte("cape_bone_iio"))
return nil
}
/*
*
*/
package main
import (
"davidsonff/fmserve/bbbdevtreeovly"
"fmt"
)
func main() {
err := bbbdevtreeovly.Load_dto("cape-bone-iio", "/lib/firmware/")
if err != nil {
panic(err)
}
fmt.Println("Success!")
}
The result is no error and no change in the system:
root@beaglebone:~# ./fmserve
BBB Device Tree Overlay: 2013/12/15 19:25:15 This is the new program...
BBB Device Tree Overlay: 2013/12/15 19:25:15 DTO File: cape-bone-iio
BBB Device Tree Overlay: 2013/12/15 19:25:15 Slots location:
/sys/devices/bone_capemgr.9/slots
Success!
root@beaglebone:~# cat /sys/devices/bone_capemgr.9/slots
0: 54:PF---
1: 55:PF---
2: 56:PF---
3: 57:PF---
4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
5: ff:P-O-L Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
It seems to me that the $SLOTS "file" is not a normal file and that I am
not understanding it properly.
I've seen posts on loading this at boot in a script file, but nothing about
changing it programmatically... Any help would be appreciated!
Thanks,
Frank
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