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Fix boot loader UART baud rate on soft reboot

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Also remove `-O3` optimization flasg, it negates `-Os`. Saves ~400 bytes.

CL: none

PUBLISHED_FROM=f40f42e4f54a8e0e003ab65ec8f5838c2d932876
This commit is contained in:
Deomid Ryabkov 2018-04-11 18:31:26 +01:00 committed by Cesanta Bot
parent e89be2e944
commit 43191db63e
2 changed files with 18 additions and 4 deletions
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20
src/common/platforms/esp8266/rboot/rboot/rboot.c
View File

@ -160,7 +160,8 @@ static uint8 calc_chksum(uint8 *start, uint8 *end) {
}
#endif
#define UART_CLKDIV_26MHZ(B) (52000000 + B / 2) / B
#define UART_CLKDIV_80MHZ(B) (80000000 + B / 2) / B
#define UART_CLKDIV_52MHZ(B) (52000000 + B / 2) / B
// prevent this function being placed inline with main
// to keep main's stack size as small as possible
@ -182,10 +183,23 @@ uint32 NOINLINE find_image(void) {
// delay to slow boot (help see messages when debugging)
//ets_delay_us(2000000);
uart_div_modify(0, UART_CLKDIV_26MHZ(115200));
/*
* UART divider depends on the APB frequency. Cold boot starts with 52MHz APB,
* SDK configures PLL, sets it to 80 and it persists across soft reset
* so on soft reset a different divider should be used. What we really want to
* know is if the PLL is running but since that is completely undocumented
* we use CPU frequency bit as a workaround: mos sets CPU to 160 MHz on startup
* so we assume that if frequency is preserved, then it's soft reset, PLL is
* running and APB is at 80 MHz.
*/
if (READ_PERI_REG(0x3ff00014) & 1) {
uart_div_modify(0, UART_CLKDIV_80MHZ(115200));
} else {
uart_div_modify(0, UART_CLKDIV_52MHZ(115200));
}
ets_delay_us(1000);
ets_printf("\r\nrBoot v1.2.1 - richardaburton@gmail.com\r\n");
ets_printf("\r\nrBoot v1.2.1-cesanta1 - richardaburton@gmail.com\r\n");
// read rom header
SPIRead(0, header, sizeof(rom_header));

2
src/common/platforms/esp8266/rboot/rboot/rboot.mk
View File

@ -23,7 +23,7 @@ LD := $(addprefix $(XTENSA_BINDIR)/,xtensa-lx106-elf-gcc)
endif
CC_WRAPPER ?=
CFLAGS = -Os -O3 -Wpointer-arith -Wundef -Werror -Wl,-EL \
CFLAGS = -Os -Wpointer-arith -Wundef -Werror -Wl,-EL \
-fno-inline-functions -nostdlib -mlongcalls -mtext-section-literals \
-D__ets__ -DIRAM='__attribute__((section(".fast.text")))' \
-DNOINSTR='__attribute__((no_instrument_function))' \