Hi @Lasya
The startup files are not part of AUTOSAR MCAL. In the standard release, usually from RTM version, our Autosar MCAL package may include a sample integration application containing an example of startup file. However that is only a sample code, you can use that as a reference. The sample application is included in version 1.0.0 and you can find the startup files here after installation:
c:\NXP\AUTOSAR\MPC5777C_MCAL4_3_RTM_1_0_0\MPC5777C_MCAL4_3_RTM_1_0_0_Sample_Application\eclipse\plugins\PlatformIntegration_TS_T2D41M10I0R0\src\startup\
There's also user manual for the application which explains how to make it working:
c:\NXP\AUTOSAR\MPC5777C_MCAL4_3_RTM_1_0_0\MPC5777C_MCAL4_3_RTM_1_0_0_Sample_Application\eclipse\plugins\PlatformIntegration_TS_T2D41M10I0R0\doc\AUTOSAR_MCAL_SA_UM.pdf
Also notice that only Windriver and GHS compilers were tested:

Regards,
Lukas