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mips: illustrates how to improve performance

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Do not require unecessary roundtrips for clocking out
data.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
This commit is contained in:
Øyvind Harboe
2011-04-01 00:00:39 +02:00
parent 2615bf4398
commit 378567da4e
4 changed files with 21 additions and 14 deletions
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9
src/flash/nor/pic32mx.c
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@@ -774,11 +774,9 @@ COMMAND_HANDLER(pic32mx_handle_unlock_command)
}
/* unlock/erase device */
mchip_cmd = MCHP_ASERT_RST;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
mips_ejtag_drscan_8_out(ejtag_info, MCHP_ASERT_RST);
mchip_cmd = MCHP_ERASE;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
mips_ejtag_drscan_8_out(ejtag_info, MCHP_ERASE);
do {
mchip_cmd = MCHP_STATUS;
@@ -791,8 +789,7 @@ COMMAND_HANDLER(pic32mx_handle_unlock_command)
alive_sleep(1);
} while ((mchip_cmd & (1 << 2)) || (!(mchip_cmd & (1 << 3))));
mchip_cmd = MCHP_DE_ASSERT_RST;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
mips_ejtag_drscan_8_out(ejtag_info, MCHP_DE_ASSERT_RST);
/* select ejtag tap */
mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);