package/boot/kobs-ng/patches/003-raw-mode.patch

   1 The downstream Freescale vendor kernel has a patch that allows determining
   2 if raw NAND flash mode is provided via a debugfs file. This is not present
   3 in upstream kernels, but the raw access support was added in the 3.19
   4 kernel, so we will check the kernel version if we can't find the file.
   5 --- a/src/mtd.c
   6 +++ b/src/mtd.c
   7 @@ -34,6 +34,7 @@
   8  #include <errno.h>
   9  #include <sys/types.h>
  10  #include <sys/ioctl.h>
  11 +#include <sys/utsname.h>
  12
  13  #include "mtd.h"
  14  #include "rand.h"
  15 @@ -808,15 +809,27 @@ struct mtd_data *mtd_open(const struct m
  16         md->cfg = *cfg;
  17
  18         /* check if use new raw access mode */
  19 +       /* by looking for debugfs from fsl patch */
  20 +       md->raw_mode_flag = 0;
  21         fp = fopen("/sys/kernel/debug/gpmi-nand/raw_mode", "r");
  22         if (!fp) {
  23 -               md->raw_mode_flag = 0;
  24 -               vp(md, "mtd: use legacy raw access mode\n");
  25 +               /* fallback to kernel version: raw access added in 3.19 */
  26 +               struct utsname uts;
  27 +               if (!uname(&uts)) {
  28 +                       int major = 0, minor = 0;
  29 +                       sscanf(uts.release, "%d.%d", &major, &minor);
  30 +                       vp(md, "mtd: Linux %d.%d\n", major, minor);
  31 +                       if ((major << 8 | minor) > (3 << 8 | 18))
  32 +                               md->raw_mode_flag = 1;
  33 +               }
  34         } else {
  35                 fclose(fp);
  36                 md->raw_mode_flag = 1;
  37 -               vp(md, "mtd: use new bch layout raw access mode\n");
  38         }
  39 +       if (md->raw_mode_flag)
  40 +               vp(md, "mtd: use new bch layout raw access mode\n");
  41 +       else
  42 +               vp(md, "mtd: use legacy raw access mode\n");
  43
  44         if (plat_config_data->m_u32UseMultiBootArea) {
  45