# Can battery-backed RAM be increased on the BL2600 SBC?

**URL:** <https://forums.digi.com/t/can-battery-backed-ram-be-increased-on-the-bl2600-sbc/16764>\
**Category:** Rabbit\
**Tags:** ram, bl2600, bbram, rabbit\
**Created:** [May 12, 2016, 5:01pm UTC](https://forums.digi.com/t/can-battery-backed-ram-be-increased-on-the-bl2600-sbc/16764 "2016-05-12T17:01:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mutantworm](https://avatars.discourse-cdn.com/v4/letter/m/d9b06d/32.png) [@mutantworm](https://forums.digi.com/u/mutantworm)\
**Post date:** [May 12, 2016, 5:01pm UTC](https://forums.digi.com/t/can-battery-backed-ram-be-increased-on-the-bl2600-sbc/16764/1 "2016-05-12T17:01:23Z")

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I need more bbram space for a project I am working on.

In the StdBios.c file there is:  
#define BBROOTDATASIZE 0x1000

Can that be changed to:  
#define BBROOTDATASIZE 0x2000

Would this cause memory problems?

Thanks

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<div class="post-metadata">

**Author:** ![TomCollins](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/tomcollins/32/37_2.png) [@TomCollins](https://forums.digi.com/u/TomCollins)\
**Post date:** [May 25, 2016, 5:21pm UTC](https://forums.digi.com/t/can-battery-backed-ram-be-increased-on-the-bl2600-sbc/16764/2 "2016-05-25T17:21:56Z")

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I think you’re limited to how much battery-backed memory is mapped to the root address space.

Use \_xalloc() to allocate battery-backed space in extended memory. You’d use xmem2root() and root2xmem() to copy data to/from that space.