35 lines
1.0 KiB
Python
35 lines
1.0 KiB
Python
# (c) Copyright 2018 by Coinkite Inc. This file is part of Coldcard <coldcardwallet.com>
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# and is covered by GPLv3 license found in COPYING.
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#
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# sram2.py - Jam some larger, long-lived objects into the SRAM2 area, which isn't used enough.
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#
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# Cautions/Notes:
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# - mpy heap does not include SRAM2, so doing manual memory alloc here.
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# - top 8k reserved for bootloader, which will wipe it on each entry
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# - top page of that is specially marked to cause reset if any attempt to change
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# - 2k at bottom reserved for code in `flashbdev.c` to use as cache data for flash writing
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# - keep this file in sync with simulated version
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#
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import uctypes
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SRAM2_START = const(0x10000000)
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# see stm32/COLDCARD/layout.ld where this is effectively defined
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_start = SRAM2_START + 2048
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def _alloc(ln):
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global _start
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rv = uctypes.bytearray_at(_start, ln)
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_start += ln
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return rv
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nvstore_buf = _alloc(4096-32)
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display_buf = _alloc(1024)
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usb_buf = _alloc(2048+12) # 2060 @ 0x10001be0
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tmp_buf = _alloc(1024)
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psbt_tmp256 = _alloc(256)
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assert _start <= 0x10006000
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# EOF
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