| The downstream Freescale vendor kernel has a patch that allows determining |
| if raw NAND flash mode is provided via a debugfs file. This is not present |
| in upstream kernels, but the raw access support was added in the 3.19 |
| kernel, so we will check the kernel version if we can't find the file. |
| --- a/src/mtd.c |
| +++ b/src/mtd.c |
| @@ -34,6 +34,7 @@ |
| #include <errno.h> |
| #include <sys/types.h> |
| #include <sys/ioctl.h> |
| +#include <sys/utsname.h> |
| |
| #include "mtd.h" |
| #include "rand.h" |
| @@ -808,15 +809,27 @@ struct mtd_data *mtd_open(const struct m |
| md->cfg = *cfg; |
| |
| /* check if use new raw access mode */ |
| + /* by looking for debugfs from fsl patch */ |
| + md->raw_mode_flag = 0; |
| fp = fopen("/sys/kernel/debug/gpmi-nand/raw_mode", "r"); |
| if (!fp) { |
| - md->raw_mode_flag = 0; |
| - vp(md, "mtd: use legacy raw access mode\n"); |
| + /* fallback to kernel version: raw access added in 3.19 */ |
| + struct utsname uts; |
| + if (!uname(&uts)) { |
| + int major = 0, minor = 0; |
| + sscanf(uts.release, "%d.%d", &major, &minor); |
| + vp(md, "mtd: Linux %d.%d\n", major, minor); |
| + if ((major << 8 | minor) > (3 << 8 | 18)) |
| + md->raw_mode_flag = 1; |
| + } |
| } else { |
| fclose(fp); |
| md->raw_mode_flag = 1; |
| - vp(md, "mtd: use new bch layout raw access mode\n"); |
| } |
| + if (md->raw_mode_flag) |
| + vp(md, "mtd: use new bch layout raw access mode\n"); |
| + else |
| + vp(md, "mtd: use legacy raw access mode\n"); |
| |
| if (plat_config_data->m_u32UseMultiBootArea) { |
| |