Thanks, Thorsten, but that didn't see to help, unfortunately... It doesn't
generate any errors, it just doesn't actually load the dto... Any other
ideas?
Frank
On Sunday, December 15, 2013 10:46:09 PM UTC-5, Thorsten von Eicken wrote:
>
> Do you perhaps need a newline terminator for the line you're writing to
> the slots "file"?
>
>
> On Sunday, December 15, 2013 11:43:21 AM UTC-8, Frank Davidson wrote:
>>
>> 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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