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spi_flash: fix the corruption of ROM after calling bootloader_execute_flash_command

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The user register, especially dummy related ones, needs to be restored, otherwise the ROM function will not work.

Introduced in dd40123129
This commit is contained in:
Michael (XIAO Xufeng) 2021-08-19 22:10:16 +08:00
parent 1c69e063d2
commit 606955382e
1 changed files with 5 additions and 0 deletions
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5
components/bootloader_support/src/flash_qio_mode.c
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@ -287,6 +287,9 @@ IRAM_ATTR static uint32_t bootloader_flash_execute_command_common(
assert(mosi_len <= 32);
assert(miso_len <= 32);
uint32_t old_ctrl_reg = SPIFLASH.ctrl.val;
uint32_t old_user_reg = SPIFLASH.user.val;
uint32_t old_user1_reg = SPIFLASH.user1.val;
SPIFLASH.ctrl.val = SPI_WP_REG_M; // keep WP high while idle, otherwise leave DIO mode
//command phase
SPIFLASH.user.usr_command = 1;
@ -317,6 +320,8 @@ IRAM_ATTR static uint32_t bootloader_flash_execute_command_common(
while(SPIFLASH.cmd.usr != 0)
{ }
SPIFLASH.ctrl.val = old_ctrl_reg;
SPIFLASH.user.val = old_user_reg;
SPIFLASH.user1.val = old_user1_reg;
uint32_t ret = SPIFLASH.data_buf[0];
if (miso_len < 32) {