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mtd: add support for switching old SST chips into QRY mode
SST 39VF160x/39VF320x and some old SST chips need a special command sequence to enter CFI QueRY mode [1]. This patch adds the relevant sequence to cfi_qry_mode_on(). Tested with 39VF3201. Signed-off-by: Guillaume LECERF <glecerf@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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@ -69,6 +69,13 @@ int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map,
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/* ST M29DW chips */
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cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
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cfi_send_gen_cmd(0x98, 0x555, base, map, cfi, cfi->device_type, NULL);
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if (cfi_qry_present(map, base, cfi))
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return 1;
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/* some old SST chips, e.g. 39VF160x/39VF320x */
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cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
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cfi_send_gen_cmd(0xAA, 0x5555, base, map, cfi, cfi->device_type, NULL);
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cfi_send_gen_cmd(0x55, 0x2AAA, base, map, cfi, cfi->device_type, NULL);
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cfi_send_gen_cmd(0x98, 0x5555, base, map, cfi, cfi->device_type, NULL);
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if (cfi_qry_present(map, base, cfi))
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return 1;
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/* QRY not found */
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