TYPE

The TYPE tag is a 32-bit unsigned integer (uint32_t) that when viewed in little-endian format, states the type of firmware image the IMG2/IMG3/IMG4/IM4P file is. Is is compared with the second parameter of image_load (register r1). If it does not match, image_load will fail and the image will not be loaded. If 0 is passed in r1, then the check is skipped.

Types

IMG2

• AppleLogo: logo (0x6C6F676F)
• BatteryCharging: batC (0x62617443)
• BatteryLow0: batl (0x6261744C)
• BatteryLow1: batL (0x6261746C)
• DeviceTree: dtre (0x64747265)
• iBoot: ibot (0x69626F74)
• LLB: llbz (0x6C6C627A)
• NeedService: nsrv (0x6E737276)
• RecoveryMode: recm (0x7265636D)

IMG3+

• Any: empty string (0x00000000)
• AppleLogo: logo (0x6C6F676F)
• BatteryCharging0 (charging – bright): chg0 (0x63686730)
• BatteryCharging1 (charging – dim): chg1 (0x63686731)
• BatteryFull: batF (0x62617446)
• BatteryLow0 (empty): bat0 (0x62617430)
• BatteryLow1 (red, composed onto empty): bat1 (0x62617431)
• Dali: dali
• DeviceTree: dtre (0x64747265)
• DeviceTree restore: rdtr
• Diagnostics: diag
• Environment variables: ienv
• FDR Trust object for AP: fdrt
• FDR Trust object for SEP: fdrs
• GlyphCharging: glyC (0x676C7943)
• GlyphPlugin: glyP (0x676C7950)
• Hypervisor/monitor: hypr
• iBEC: ibec (0x69626563)
• iBoot: ibot (0x69626F74)
• iBSS: ibss (0x69627373)
• Kernelcache: krnl (0x62736E6C)
• Kernelcache restore: rkrn
• LLB: illb (0x696C6C62)
• NeedService: nsrv (0x6E737276)
• OS restore image: rosi
• PE’s RTOS environment: pert
• PE’s Hammer test: hmmr
• Ramdisk: rdsk (0x7264736B)
• RecoveryMode: recm (0x7265636D)
• SEP-Firmware (SEP OS): sepi (0x73657069)
• SEP OS (restore): rsep
• SiVal’s (Silicon Validation) CFE loader: cfel
• SiVal’s RBM test: rbmt
• SiVal’s PHLEET test: phlt
• tsys tester

References

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