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- 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) {
-
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