FreeCalypso > hg > freecalypso-tools

annotate target-utils/include/romvars.h @ 1000:39a6090a052a

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doc/How-flash-really-works: article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Dec 2023 09:08:19 +0000
parents e7502631a0f9
children
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1 /*
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2 * Our loadagent will always be loaded into Calypso targets by the on-chip
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3 * boot ROM operating in the UART download mode. The lowest IRAM address
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4 * at which we can load our code is 0x800750; somewhat lower at 0x800518
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5 * the boot ROM downloader has a few variables which may have been intended
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6 * to be private to the boot ROM, but which are useful to us. For example,
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7 * by looking at these variables, we can see which of the two UARTs was
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8 * used to feed our code to the boot ROM, and use the same UART for
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9 * subsequent communication - without building multiple versions of our
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10 * loadagent or resorting to other ugliness.
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11 *
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12 * This header file defines the layout of the IRAM structure in question,
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13 * based on the disassembly of the boot ROM.
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14 */
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16 #ifndef __ROMVARS_H
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17 #define __ROMVARS_H
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19 #include "types.h"
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20
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21 struct boot_rom_vars {
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22 u8 baud_rate_code;
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23 u8 pad1[3];
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24 u32 uart_timeout;
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25 u8 uart_id;
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26 u8 pll_config;
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27 u16 cs_ws_config;
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28 u8 clktcxo_13mhz;
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29 u8 rhea_cntl;
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30 u16 chksum_cmd;
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31 u16 chksum_accum;
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32 u16 pad2;
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33 u32 branch_addr;
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34 };
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36 #endif /* include guard */