27c9d80f51
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46 lines
1.4 KiB
Diff
46 lines
1.4 KiB
Diff
The downstream Freescale vendor kernel has a patch that allows determining
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if raw NAND flash mode is provided via a debugfs file. This is not present
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in upstream kernels, but the raw access support was added in the 3.19
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kernel, so we will check the kernel version if we can't find the file.
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--- a/src/mtd.c
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+++ b/src/mtd.c
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@@ -34,6 +34,7 @@
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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+#include <sys/utsname.h>
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#include "mtd.h"
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#include "rand.h"
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@@ -808,15 +809,27 @@ struct mtd_data *mtd_open(const struct m
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md->cfg = *cfg;
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/* check if use new raw access mode */
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+ /* by looking for debugfs from fsl patch */
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+ md->raw_mode_flag = 0;
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fp = fopen("/sys/kernel/debug/gpmi-nand/raw_mode", "r");
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if (!fp) {
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- md->raw_mode_flag = 0;
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- vp(md, "mtd: use legacy raw access mode\n");
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+ /* fallback to kernel version: raw access added in 3.19 */
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+ struct utsname uts;
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+ if (!uname(&uts)) {
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+ int major = 0, minor = 0;
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+ sscanf(uts.release, "%d.%d", &major, &minor);
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+ vp(md, "mtd: Linux %d.%d\n", major, minor);
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+ if ((major << 8 | minor) > (3 << 8 | 18))
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+ md->raw_mode_flag = 1;
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+ }
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} else {
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fclose(fp);
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md->raw_mode_flag = 1;
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- vp(md, "mtd: use new bch layout raw access mode\n");
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}
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+ if (md->raw_mode_flag)
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+ vp(md, "mtd: use new bch layout raw access mode\n");
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+ else
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+ vp(md, "mtd: use legacy raw access mode\n");
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if (plat_config_data->m_u32UseMultiBootArea) {
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