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.
10 #include <sys/ioctl.h>
11 +#include <sys/utsname.h>
15 @@ -808,15 +809,27 @@ struct mtd_data *mtd_open(const struct m
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");
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 */
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;
36 md->raw_mode_flag = 1;
37 - vp(md, "mtd: use new bch layout raw access mode\n");
39 + if (md->raw_mode_flag)
40 + vp(md, "mtd: use new bch layout raw access mode\n");
42 + vp(md, "mtd: use legacy raw access mode\n");
44 if (plat_config_data->m_u32UseMultiBootArea) {