SEGGER Microcontroller embOS

embOS is a real-time operating system for embedded applications designed to offer the benefits of a fully fledged multitasking system at minimum cost. The kernel is fully interruptible and so efficient that it can be used in very time-critical situations. The memory footprint in both RAM and ROM is so small that it can be used in single-chip applications, leaving maximum room for the user-program.

Other features of the operating system include:

preemptive scheduling of tasks
unlimited number of mailboxes and semaphores
support for nested interrupts

http://www.segger.com/embos.html

Supported Devices

Actel (ARM7/ARM9/Cortex Family)
COREMP7, Cortex-M1
Analog Devices (ARM7/ARM9/Cortex Family)
ADuC7019, ADuC7020, ADuC7021, ADuC7022, ADuC7024, ADuC7025, ADuC7026, ADuC7027, ADuC7032, ADuC7033, ADuC7128, ADuC7129
ARM (ARM7/ARM9/Cortex Family)
Cortex-M1 (Altera)
Atmel (ARM7/ARM9/Cortex Family)
AT91C140, AT91F40416, AT91F40816, AT91FR40162, AT91FR4042, AT91FR4081, AT91M40400, AT91M40800, AT91M40807, AT91M42800A, AT91M43300, AT91M55800A, AT91M63200, AT91R40008, AT91R40807, AT91RM3400, AT91RM9200, AT91SAM7A1, AT91SAM7A2, AT91SAM7A3, AT91SAM7L128, AT91SAM7L64, AT91SAM7S128, AT91SAM7S256, AT91SAM7S32, AT91SAM7S321, AT91SAM7S512, AT91SAM7S64, AT91SAM7SE256, AT91SAM7SE32, AT91SAM7SE512, AT91SAM7X128, AT91SAM7X256, AT91SAM7XC128, AT91SAM7XC256, AT91SAM9260, AT91SAM9261, AT91SAM9263, AT91SAM9G20, AT91SAM9R64, AT91SAM9RL64, AT91SAM9XE128, AT91SAM9XE256, AT91SAM9XE512
AustriaMicroSystems (ARM7/ARM9/Cortex Family)
AS3525
Cirrus Logic (ARM7/ARM9/Cortex Family)
CS740110-IQZ, CS740120-IQZ, CS740130-IQZ
Freescale Semiconductor (ARM7/ARM9/Cortex Family)
MAC7101, MAC7104, MAC7105, MAC7106, MAC7111, MAC7112, MAC7114, MAC7115, MAC7116, MAC7121, MAC7122, MAC7124, MAC7125, MAC7126, MAC7131, MAC7134, MAC7135, MAC7136, MAC7141, MAC7142, MAC7144, MC9328MX21, MCIMX27, MCIMX27L
Luminary Micro (ARM7/ARM9/Cortex Family)
LM3S101, LM3S102, LM3S1110, LM3S1133, LM3S1138, LM3S1150, LM3S1162, LM3S1165, LM3S1332, LM3S1435, LM3S1439, LM3S1512, LM3S1538, LM3S1601, LM3S1607, LM3S1608, LM3S1620, LM3S1625, LM3S1626, LM3S1627, LM3S1635, LM3S1637, LM3S1751, LM3S1776, LM3S1850, LM3S1911, LM3S1918, LM3S1937, LM3S1958, LM3S1960, LM3S1968, LM3S2110, LM3S2139, LM3S2276, LM3S2410, LM3S2412, LM3S2432, LM3S2533, LM3S2601, LM3S2608, LM3S2616, LM3S2620, LM3S2637, LM3S2651, LM3S2671, LM3S2678, LM3S2730, LM3S2739, LM3S2776, LM3S2911, LM3S2918, LM3S2939, LM3S2948, LM3S2950, LM3S2965, LM3S300, LM3S301, LM3S308, LM3S310, LM3S315, LM3S316, LM3S317, LM3S328, LM3S3651, LM3S3739, LM3S3748, LM3S3749, LM3S3759, LM3S3768, LM3S5632, LM3S5652, LM3S5662, LM3S5732, LM3S5737, LM3S5739, LM3S5747, LM3S5749, LM3S5752, LM3S5757, LM3S5762, LM3S5767, LM3S5768, LM3S5769, LM3S600, LM3S601, LM3S608, LM3S610, LM3S6100, LM3S611, LM3S6110, LM3S612, LM3S613, LM3S615, LM3S617, LM3S618, LM3S628, LM3S6420, LM3S6422, LM3S6432, LM3S6537, LM3S6610, LM3S6611, LM3S6618, LM3S6633, LM3S6637, LM3S6730, LM3S6753, LM3S6911, LM3S6918, LM3S6938, LM3S6950, LM3S6952, LM3S6965, LM3S800, LM3S801, LM3S808, LM3S811, LM3S812, LM3S815, LM3S817, LM3S818, LM3S828, LM3S8530, LM3S8538, LM3S8630, LM3S8730, LM3S8733, LM3S8738, LM3S8930, LM3S8933, LM3S8938, LM3S8962, LM3S8970, LM3S8971
Nuvoton (ARM7/ARM9/Cortex Family)
W90N740, W90N745, W90P710
NXP (founded by Philips) (ARM7/ARM9/Cortex Family)
LH75400, LH75401, LH75410, LH75411, LH79520, LH79524, LH79525, LH7A400, LH7A404, LPC2101, LPC2102, LPC2103, LPC2104, LPC2105, LPC2106, LPC2109, LPC2109/01, LPC2114, LPC2119, LPC2124, LPC2129, LPC2131, LPC2131/01, LPC2132, LPC2132/01, LPC2134, LPC2134/01, LPC2136, LPC2136/01, LPC2138, LPC2138/01, LPC2141, LPC2142, LPC2144, LPC2146, LPC2148, LPC2194, LPC2210, LPC2212, LPC2214, LPC2220, LPC2290, LPC2292, LPC2294, LPC2364, LPC2366, LPC2368, LPC2378, LPC2387, LPC2388, LPC2420, LPC2460, LPC2468, LPC2470, LPC2478, LPC2880, LPC2888, LPC2917, LPC2917/01, LPC2919, LPC2919/01, LPC3130, LPC3131, LPC3180, LPC3220, LPC3230, LPC3240, LPC3250
OKI (ARM7/ARM9/Cortex Family)
ML674000, ML674001, ML674002, ML674003, ML675001, ML675002, ML675003, ML67Q4050, ML67Q4051, ML67Q4060, ML67Q4061, ML67Q5250, ML696201, ML69Q6203
Samsung (ARM7/ARM9/Cortex Family)
S3C2410A, S3C2440A, S3C44B0X, S3C4510B, S3F4A0KR, S3F4A1HR, S3F4A2FR
STMicroelectronics (ARM7/ARM9/Cortex Family)
STA2051, STM32F101C6, STM32F101C8, STM32F101CB, STM32F101R6, STM32F101R8, STM32F101RB, STM32F101RC, STM32F101RD, STM32F101RE, STM32F101T6, STM32F101T8, STM32F101V8, STM32F101VB, STM32F101VC, STM32F101VD, STM32F101VE, STM32F101ZC, STM32F101ZD, STM32F101ZE, STM32F102C4, STM32F102C6, STM32F102R4, STM32F102R6, STM32F103C6, STM32F103C8, STM32F103CB, STM32F103R6, STM32F103R8, STM32F103RB, STM32F103RC, STM32F103RD, STM32F103RE, STM32F103T6, STM32F103T8, STM32F103V8, STM32F103VB, STM32F103VC, STM32F103VD, STM32F103VE, STM32F103ZC, STM32F103ZD, STM32F103ZE, STR710FZ1, STR710FZ2, STR711FR0, STR711FR1, STR711FR2, STR712FR0, STR712FR1, STR712FR2, STR715FR0, STR730FZ1, STR730FZ2, STR731FV0, STR731FV1, STR731FV2, STR735FZ1, STR735FZ2, STR736FV0, STR736FV1, STR750FL2, STR750FV0, STR750FV1, STR750FV2, STR751FR0, STR751FR1, STR751FR2, STR752FR0, STR752FR1, STR752FR2, STR755FR0, STR755FR1, STR755FR2, STR755FV0, STR755FV1, STR755FV2, STR910FAM32, STR910FAW32, STR910FAZ32, STR910FM32, STR910FW32, STR911FAM42, STR911FAM44, STR911FAM46, STR911FAM47, STR911FAW42, STR911FAW44, STR911FAW46, STR911FAW47, STR911FM42, STR911FM44, STR912FAW42, STR912FAW44, STR912FAW46, STR912FAW47, STR912FAZ42, STR912FAZ44, STR912FAZ46, STR912FAZ47, STR912FW42, STR912FW44
Texas Instruments (ARM7/ARM9/Cortex Family)
TMS470R1A128, TMS470R1A256, TMS470R1A288, TMS470R1A384, TMS470R1A64, TMS470R1B1M, TMS470R1B512, TMS470R1B768
Toshiba (ARM7/ARM9/Cortex Family)
TMPA910CRAXBG, TMPM330FDFG, TMPM330FWFG, TMPM330FYFG
Zilog (ARM7/ARM9/Cortex Family)
ZA9L

Use the feedback form to tell us about other RTOS, Kernels, or RTOS/Kernel vendors that should be listed.