We have been using PPC with a AMD flash (Spansion S29GL128M) on it for our applications. We are running Montavista linux on it. Recently we replaced the AMD flash with ST flash (M29W128FH). The u-boot boots up and during the kernel boot, I am getting the following error messages and the system doesn't boot after this:

jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000000: 0x0020 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000001c: 0x2212 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000020: 0x0020 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000003c: 0x2212 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000040: 0x0020 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000005c: 0x2212 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000060: 0x0020 instead

It would be really great if someone could let me know what is going wrong in this.