Reset ROM functions only work once

[btashton]

The reset functions in the ROM have a bug where they do not first clear the swrst bit prior to writing it. This means that if you issue a GLB_SW_System_Reset twice the second one will hang in the while loop.

ROM function looks like this

void GLB_SW_System_Reset(void)

{
  _BL602_HBN_GLB = _BL602_HBN_GLB & 0xfffffffc;
  _BL602_CLK_CFG0 = _BL602_CLK_CFG0 & 0xff0000ff;
  _DAT_40000ffc = 0;
  _BL602_SWRST_CFG2 = _BL602_SWRST_CFG2 & 0xfffffff8 | 6;
  do {
    BL602_Delay_US(10);
  } while( true );
}

should be

void GLB_SW_System_Reset(void)

{
  _BL602_HBN_GLB = _BL602_HBN_GLB & 0xfffffffc;
  _BL602_CLK_CFG0 = _BL602_CLK_CFG0 & 0xff0000ff;
  _DAT_40000ffc = 0;
  _BL602_SWRST_CFG2 = _BL602_SWRST_CFG2 & 0xfffffff8;
  _BL602_SWRST_CFG2 = _BL602_SWRST_CFG2 & 0xfffffff8 | 6;
  do {
    BL602_Delay_US(10);
  } while( true );
}

Can we also get some documentation on what register at address 0x40000ffc does? It seems to be reset when the root clock is updated

[btashton]

I was wrong. This function does clear the bit before setting it.