diff --git a/chipdrivers.h b/chipdrivers.h
index dccd1ff..a3da865 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -204,5 +204,11 @@
 int spi_block_erase_20_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
 int spi_block_erase_52_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
 int spi_block_erase_d8_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
+int spi_byte_program_4ba_ereg(struct flashctx *flash, unsigned int addr, uint8_t databyte);
+int spi_nbyte_program_4ba_ereg(struct flashctx *flash, unsigned int addr, const uint8_t *bytes, unsigned int len);
+int spi_nbyte_read_4ba_ereg(struct flashctx *flash, unsigned int addr, uint8_t *bytes, unsigned int len);
+int spi_block_erase_20_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
+int spi_block_erase_52_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
+int spi_block_erase_d8_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
 
 #endif /* !__CHIPDRIVERS_H__ */