Sony will have a 6 percent stake in PalmSource, the operating system unit, which moved from Santa Clara to Sunnyvale this summer. The hardware division, PalmSolutions, relocated to Milpitas, one of a series of steps the company is taking to divide. Next week, Palm will enact a reverse stock split in hopes of boosting its stock price to $5 or higher. Palm shares rose 6 cents Tuesday to close at 67 cents in Nasdaq trading.