view target-utils/include/romvars.h @ 965:2969032bdfac

fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing The only 100% safe way to pass a NULL pointer as a function argument in K&R C is to cast 0 to a pointer type; failing to do so may cause mysterious bugs (invalid stack frames or garbage in argument registers) on 64-bit machines. This issue has already been fixed in most of FC host tools, but I just found some missed spots: passing of NULL UDH to PDU encoding functions in fcup-smsend[mult] in the case of single (not concatenated) SMS.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 01 Sep 2023 07:33:51 +0000
parents e7502631a0f9
children
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/*
 * Our loadagent will always be loaded into Calypso targets by the on-chip
 * boot ROM operating in the UART download mode.  The lowest IRAM address
 * at which we can load our code is 0x800750; somewhat lower at 0x800518
 * the boot ROM downloader has a few variables which may have been intended
 * to be private to the boot ROM, but which are useful to us.  For example,
 * by looking at these variables, we can see which of the two UARTs was
 * used to feed our code to the boot ROM, and use the same UART for
 * subsequent communication - without building multiple versions of our
 * loadagent or resorting to other ugliness.
 *
 * This header file defines the layout of the IRAM structure in question,
 * based on the disassembly of the boot ROM.
 */

#ifndef __ROMVARS_H
#define	__ROMVARS_H

#include "types.h"

struct boot_rom_vars {
	u8	baud_rate_code;
	u8	pad1[3];
	u32	uart_timeout;
	u8	uart_id;
	u8	pll_config;
	u16	cs_ws_config;
	u8	clktcxo_13mhz;
	u8	rhea_cntl;
	u16	chksum_cmd;
	u16	chksum_accum;
	u16	pad2;
	u32	branch_addr;
};

#endif	/* include guard */