1What: /sys/bus/platform/devices/GGL0001:*/BINF.2 2Date: May 2022 3KernelVersion: 5.19 4Description: 5 This file shows information about the current boot of 6 the active EC firmware. 7 8 == =============================== 9 0 Read only (recovery) firmware. 10 1 Rewritable firmware. 11 == =============================== 12 13What: /sys/bus/platform/devices/GGL0001:*/BINF.3 14Date: May 2022 15KernelVersion: 5.19 16Description: 17 This file shows information about the current boot of 18 the active main firmware type. 19 20 == ===================================== 21 0 Recovery. 22 1 Normal. 23 2 Developer. 24 3 Netboot (factory installation only). 25 == ===================================== 26 27What: /sys/bus/platform/devices/GGL0001:*/CHSW 28Date: May 2022 29KernelVersion: 5.19 30Description: 31 This file shows the switch position for the Chrome OS specific 32 hardware switches when the firmware is booted. 33 34 ==== =========================================== 35 0 No changes. 36 2 Recovery button was pressed. 37 4 Recovery button was pressed (EC firmware). 38 32 Developer switch was enabled. 39 512 Firmware write protection was disabled. 40 ==== =========================================== 41 42What: /sys/bus/platform/devices/GGL0001:*/FMAP 43Date: May 2022 44KernelVersion: 5.19 45Description: 46 This file shows the physical memory address of the start of 47 the main processor firmware flashmap. 48 49What: /sys/bus/platform/devices/GGL0001:*/FRID 50Date: May 2022 51KernelVersion: 5.19 52Description: 53 This file shows the firmware version for the read-only portion 54 of the main processor firmware. 55 56What: /sys/bus/platform/devices/GGL0001:*/FWID 57Date: May 2022 58KernelVersion: 5.19 59Description: 60 This file shows the firmware version for the rewritable portion 61 of the main processor firmware. 62 63What: /sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.0 64Date: May 2022 65KernelVersion: 5.19 66Description: 67 This file shows the type of the GPIO signal for the Chrome OS 68 specific GPIO assignments. 69 70 =========== ================================== 71 1 Recovery button. 72 2 Developer mode switch. 73 3 Firmware write protection switch. 74 256 to 511 Debug header GPIO 0 to GPIO 255. 75 =========== ================================== 76 77What: /sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.1 78Date: May 2022 79KernelVersion: 5.19 80Description: 81 This file shows the signal attributes of the GPIO signal. 82 83 == ======================= 84 0 Signal is active low. 85 1 Signal is active high. 86 == ======================= 87 88What: /sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.2 89Date: May 2022 90KernelVersion: 5.19 91Description: 92 This file shows the GPIO number on the specified GPIO 93 controller. 94 95What: /sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.3 96Date: May 2022 97KernelVersion: 5.19 98Description: 99 This file shows the name of the GPIO controller. 100 101What: /sys/bus/platform/devices/GGL0001:*/HWID 102Date: May 2022 103KernelVersion: 5.19 104Description: 105 This file shows the hardware ID for the Chromebook. 106 107What: /sys/bus/platform/devices/GGL0001:*/MECK 108Date: May 2022 109KernelVersion: 5.19 110Description: 111 This binary file returns the SHA-1 or SHA-256 hash that is 112 read out of the Management Engine extended registers during 113 boot. The hash is exported vi ACPI so the OS can verify that 114 the Management Engine firmware has not changed. If Management 115 Engine is not present, or if the firmware was unable to read the 116 extended registers, this buffer size can be zero. 117 118What: /sys/bus/platform/devices/GGL0001:*/VBNV.0 119Date: May 2022 120KernelVersion: 5.19 121Description: 122 This file shows the offset in CMOS bank 0 of the verified boot 123 non-volatile storage block, counting from the first writable 124 CMOS byte (that is, 'offset = 0' is the byte following the 14 125 bytes of clock data). 126 127What: /sys/bus/platform/devices/GGL0001:*/VBNV.1 128Date: May 2022 129KernelVersion: 5.19 130Description: 131 This file shows the size in bytes of the verified boot 132 non-volatile storage block. 133 134What: /sys/bus/platform/devices/GGL0001:*/VDAT 135Date: May 2022 136KernelVersion: 5.19 137Description: 138 This binary file returns the verified boot data block shared 139 between the firmware verification step and the kernel 140 verification step. 141