| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | |