I am using RVDS for developing security application over SC100 core.
I have a special requirement, that No variables should be placed at the last two bytes of every 256 Bytes block of RAM or Data area of Flash. Please help me how to achieve this with ARM linker\Compiler options.
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ARM Linker, Placing variables in memory, special cases
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Jerry Fan 
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Posted 07 May 2011 - 08:37 AM
I am not very fimiliar with RVDS. But i keil uvison, a lot of "short var_nouse __at__ (RAM_DATA_BASE + 256 -2)" and "short c_var_nouse __at__(ROM_RODATA_BASE + 256 -2)" can be used to reserverd the RAM or Flash space(last two byte of every 256 bytes). In the link script, .data section should map to RAM_DATA_BASE and .rodata section should map to RAM_DATA_BASE. This method is not the best way but I think it works. If you find the smarter way, pls update. BTW, why do you want to reserver that two bytes.?
#3
junaid
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Posted 12 May 2011 - 07:31 AM
Hi Jerry Fan,
<<why do you want to reserver that two bytes>>
I am writing some security applications, where i need to store the 2 Byte CRC of every RAM and Flash Data pages at the end of every Pages ( 1 Page = 256 Bytes). for that linker should not map any variable at the last two bytes of every 256 Byte block.
regards,
junaid
<<why do you want to reserver that two bytes>>
I am writing some security applications, where i need to store the 2 Byte CRC of every RAM and Flash Data pages at the end of every Pages ( 1 Page = 256 Bytes). for that linker should not map any variable at the last two bytes of every 256 Byte block.
regards,
junaid
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junaid
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Posted 12 May 2011 - 07:35 AM
Jerry Fan, on 07 May 2011 - 08:37 AM, said:
I am not very fimiliar with RVDS. But i keil uvison, a lot of "short var_nouse __at__ (RAM_DATA_BASE + 256 -2)" and "short c_var_nouse __at__(ROM_RODATA_BASE + 256 -2)" can be used to reserverd the RAM or Flash space(last two byte of every 256 bytes). In the link script, .data section should map to RAM_DATA_BASE and .rodata section should map to RAM_DATA_BASE. This method is not the best way but I think it works. If you find the smarter way, pls update. BTW, why do you want to reserver that two bytes.?
Hi Jerry Fan,
<<why do you want to reserver that two bytes>>
I am writing some security applications, where i need to store the 2 Byte CRC of every RAM and Flash Data pages at the end of every Pages ( 1 Page = 256 Bytes). for that linker should not map any variable at the last two bytes of every 256 Byte block.
regards,
junaid
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