hello,I'm using beagle bone balack develop linux, first I want to load linux kernel and then boot ,but at last I got an error as follow which is" drm_kms_helper: panic occurred, switching back to text console",what does this mean, how can I solve this problem?waitting for your help!
U-Boot# setenv ipaddr 192.168.16.11 U-Boot# setenv serverip 192.168.16.55 U-Boot# tftp 0x80200000 uImage-BBB link up on port 0, speed 100, full duplex Using cpsw device TFTP from server 192.168.16.55; our IP address is 192.168.16.11 Filename 'uImage-BBB'. Load address: 0x80200000 Loading: ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ############### 348.6 KiB/s done Bytes transferred = 4402988 (432f2c hex) U-Boot# setenv bootargs console=ttyO0,115200n8 quiet root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait U-Boot# bootm 0x80200000 ## Booting kernel from Legacy Image at 80200000 ... Image Name: Linux-3.8.13-00737-gf3d254d8 Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 4402924 Bytes = 4.2 MiB Load Address: 80008000 Entry Point: 80008000 Verifying Checksum ... OK Loading Kernel Image ... OK OK Starting kernel ... Uncompressing Linux... done, booting the kernel. [ 0.196048] omap2_mbox_probe: platform not supported [ 0.206786] tps65217-bl tps65217-bl: no platform data provided [ 0.283336] bone-capemgr bone_capemgr.9: slot #0: No cape found [ 0.320442] bone-capemgr bone_capemgr.9: slot #1: No cape found [ 0.357550] bone-capemgr bone_capemgr.9: slot #2: No cape found [ 0.394659] bone-capemgr bone_capemgr.9: slot #3: No cape found [ 0.414458] bone-capemgr bone_capemgr.9: slot #6: BB-BONELT-HDMIN conflict P8.45 (#5:BB-BONELT-HDMI) [ 0.424060] bone-capemgr bone_capemgr.9: slot #6: Failed verification [ 0.444488] omap_hsmmc mmc.5: of_parse_phandle_with_args of 'reset' failed [ 0.451781] bone-capemgr bone_capemgr.9: loader: failed to load slot-6 BB-BONELT-HDMIN:00A0 (prio 2) [ 0.518112] pinctrl-single 44e10800.pinmux: pin 44e10854 already requested by 44e10800.pinmux; cannot claim for gpio-leds.8 [ 0.529808] pinctrl-single 44e10800.pinmux: pin-21 (gpio-leds.8) status -22 [ 0.537113] pinctrl-single 44e10800.pinmux: could not request pin 21 on device pinctrl-single [ 1.391116] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2) [ 1.399948] [] (unwind_backtrace+0x1/0x8c) from [] (panic+0x55/0x14c) [ 1.408497] [] (panic+0x55/0x14c) from [] (mount_block_root+0x13b/0x178) [ 1.417303] [] (mount_block_root+0x13b/0x178) from [] (mount_root+0x8b/0xa8) [ 1.426477] [] (mount_root+0x8b/0xa8) from [] (prepare_namespace+0xc5/0x118) [ 1.435639] [] (prepare_namespace+0xc5/0x118) from [] (kernel_init+0x7/0x90) [ 1.444814] [] (kernel_init+0x7/0x90) from [] (ret_from_fork+0x11/0x34) [ 1.453523] drm_kms_helper: panic occurred, switching back to text console