Hello everyone, I am the owner of an AML-S905X-CC ARM board, also called "Le Potato" with a full GNU/Linux system running on an SD card using kernel 4.20. I also bought an eMMC 5.x module on loverpi: https://www.loverpi.com/collections/libre-computer-project/products/libre-computer-board-emmc-5-x-module?variant=4173557729 I tried to use the eMMC module in order to put the system on it. Once the system is booted from SD card, i plugged the eMMC module and tried to detect it using the same command used by lc_redetect_emmc script provided by libre computer: > $ echo -n d0074000.mmc > /sys/bus/platform/drivers/meson-gx-mmc/unbind > $ echo -n d0074000.mmc > /sys/bus/platform/drivers/meson-gx-mmc/bind On the first command (the unbind) i get a kernel segfault: ------------------------------ 8< --------------------------- [ 443.872211] Unable to handle kernel paging request at virtual address fffe0000138a03c8 [ 443.874469] Mem abort info: [ 443.877228] ESR = 0x96000044 [ 443.880246] Exception class = DABT (current EL), IL = 32 bits [ 443.886109] SET = 0, FnV = 0 [ 443.889128] EA = 0, S1PTW = 0 [ 443.892232] Data abort info: [ 443.895079] ISV = 0, ISS = 0x00000044 [ 443.898874] CM = 0, WnR = 1 [ 443.901807] [fffe0000138a03c8] address between user and kernel address ranges [ 443.908882] Internal error: Oops: 96000044 [#1] SMP [ 443.913711] Modules linked in: cfg80211 rfkill 8021q garp mrp stp llc dw_hdmi_cec meson_dw_hdmi dw_hdmi meson_drm drm_kms_helper dwmac_generic drm dwmac_meson8b stmmac_platform drm_panel_orientation_quirks crc32_ce stmmac syscopyarea crct10dif_ce sysfi llrect sysimgblt ptp fb_sys_fops pps_core meson_ir rc_core meson_gxbb_wdt [ 443.942176] CPU: 0 PID: 467 Comm: bash Tainted: G W 4.19.13_1 #1 [ 443.949416] Hardware name: amlogic p212/p212, BIOS 2019.01-rc2-00176-gf97c49d6a2 01/02/2019 [ 443.957699] pstate: 00400085 (nzcv daIf +PAN -UAO) [ 443.962450] pc : queued_spin_lock_slowpath+0x228/0x2d0 [ 443.967533] lr : meson_mmc_irq+0x290/0x2a0 [ 443.971583] sp : ffff00000fb0fa00 [ 443.974860] x29: ffff00000fb0fa00 x28: ffff8000105ef118 [ 443.980121] x27: ffff8000105ef118 x26: 0000000000000000 [ 443.985382] x25: 0000000000000000 x24: ffff800010633728 [ 443.990643] x23: 0000000000000013 x22: ffff800010633858 [ 443.995905] x21: ffff800005fab800 x20: 000000006b6b6b6b [ 444.001166] x19: ffff800005fab820 x18: 0000000000000000 [ 444.006427] x17: 0000000000000000 x16: 0000000000000000 [ 444.011688] x15: ffffffffffffffff x14: 6d6d2e3030303437 [ 444.016950] x13: ff00000000000000 x12: 0000000000000040 [ 444.022211] x11: 0000000000000228 x10: 0000000000000020 [ 444.027472] x9 : 0000000000000000 x8 : 0000000000040000 [ 444.032734] x7 : ffff000009f24460 x6 : ffff80007fc7de80 [ 444.037995] x5 : ffff000009f42518 x4 : ffff80007fc7de80 [ 444.043256] x3 : ffff000009f236c8 x2 : ffff00000995de80 [ 444.048517] x1 : ffff00000995deb0 x0 : ffff80007fc7de88 [ 444.053781] Process bash (pid: 467, stack limit = 0x0000000086539f6f) [ 444.060161] Call trace: [ 444.062580] queued_spin_lock_slowpath+0x228/0x2d0 [ 444.067322] meson_mmc_irq+0x290/0x2a0 [ 444.071032] __free_irq+0x184/0x318 [ 444.074480] free_irq+0x40/0x80 [ 444.077586] devm_irq_release+0x24/0x30 [ 444.081382] release_nodes+0x1e0/0x2e0 [ 444.085089] devres_release_all+0x60/0x88 [ 444.089057] device_release_driver_internal+0x1c8/0x248 [ 444.094231] device_release_driver+0x28/0x38 [ 444.098459] unbind_store+0xdc/0x148 [ 444.101994] drv_attr_store+0x40/0x58 [ 444.105627] sysfs_kf_write+0x5c/0x78 [ 444.109240] kernfs_fop_write+0xe8/0x1e0 [ 444.113126] __vfs_write+0x60/0x190 [ 444.116570] vfs_write+0xac/0x1b0 [ 444.119848] ksys_write+0x6c/0xd0 [ 444.123125] __arm64_sys_write+0x24/0x30 [ 444.127015] el0_svc_common+0x94/0xe8 [ 444.130629] el0_svc_handler+0x38/0x80 [ 444.134340] el0_svc+0x8/0xc [ 444.137187] Code: d37c0401 910020c0 8b010041 f865d8e5 (f8256826) [ 444.143223] ---[ end trace 62541ec2ffe020f2 ]--- Segmentation fault ------------------------------ 8< --------------------------- I also tried this patch https://patchwork.kernel.org/cover/10739097/ as advised by narmstrong without any luck. I also tried only removing the "non-removable" property also without luck. With or without those patches, when i plug the eMMC nothing happened, nothing in dmesg or any mmc device appearing in /dev It must also be noted that the eMMC is shipped with a system that work properly so some working code must exist somewhere :) Regards, Elie
